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| INTEGRATED CIRCUITS TPM754A Microcontroller with TrackPointTM microcode from IBM Preliminary specification Replaces datasheet TPM754 of 1997 Dec 03 IC28 Data Handbook 1999 Nov 11 Philips Semiconductors Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A The Philips Semiconductors TPM754 is a small package, low cost, ROM-coded 80C51 with IBM(R)'s TrackPointTM pointing algorithms and control code. TrackPoint is the result of years of human factors research and innovation at IBM. The result is a "velocity sensitive" pointing solution more efficient and easier to use than "position sensitive" devices such as the mouse, the trackball, or the touchpad. IBM has licensed Philips Semiconductors to sell microcontrollers with TrackPoint code. By purchasing a TPM from Philips, the purchaser becomes a sub-licensee of Philips. The selling price of Philips' TPM includes the royalties for IBM's intellectual property, which Philips in turn pays to IBM. Customers for TPMs do not need to sign any licensing agreement with either IBM or Philips. This code is the intellectual property of IBM, which is covered by numerous patents, and must be treated accordingly. The TPM754 contains IBM(R) TrackPointTM code, a single module PCA, a 256 x 8 RAM, 21 I/O lines, two 16-bit counter/timers, a two-priority level interrupt structure, a full duplex serial channel, an on-chip oscillator, and an 8-bit D/A converter. For identical device without TrackPoint code, see the 8XC754 datasheet. PIN CONFIGURATION RxD/T0/P3.4 TxD/T1/P3.5 ECI/P3.6 INT1/P3.7 RST X2 X1 VSS ZIN YIN XIN 1 2 3 4 5 6 7 8 9 10 11 PLASTIC SHRINK SMALL OUTLINE PACKAGE 28 P3.3 27 P3.2 26 P3.1 25 P3.0 24 INT0/P1.0 23 CEX/P1.1 22 VCC 21 P1.2 20 XYDAC 19 ZDAC/ASEL 18 XYSOURCE 17 XYDACBIAS 16 VREG 15 DECOUPLE XYZRAMP 12 AVSS 13 AVCC 14 SU00726B FEATURES * 80C51-based architecture * Small package sizes - 28-pin SSOP * Power control modes: - Idle mode - Power-down mode * 256 x 8 RAM * Two 16-bit auto reloadable counter/timers * Single module PCA counter/timer * Full duplex serial channel * Boolean processor * CMOS and TTL compatible ORDERING INFORMATION ORDERING CODE PTPM754A DB TEMPERATURE RANGE C AND PACKAGE 0 to +70, 28-pin Shrink Small Outline Package FREQUENCY 3.5 to 12 MHz DRAWING NUMBER SOT341-1 NOTE: 1. PTPM754A has improved start-up from low-voltage power down. IBM is a registered trademark, and TrackPoint is a trademark of IBM Corporation. 1999 Nov 11 2 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A PIN DESCRIPTION MNEMONIC VSS VCC P1.0-P1.2 DIP PIN NO. 8 22 21, 23, 24 TYPE I I I/O Circuit Ground Potential. Supply voltage during normal, idle, and power-down operation. Port 1: Port 1 is a 3-bit bidirectional I/O port with internal pull-ups on P1.0 and P1.1. Port 1 pins that have 1s written to them can be used as inputs. As inputs, port 1 pins that are externally pulled low will source current because of the internal pull-ups (P1.0, P1.1). (See DC Electrical Characteristics: IIL). Port 1 also serves the special function features listed below (Note: P1.0 does not have the strong pullup that is on for 2 oscillator periods.): INT0 (P1.0): External interrupt 0. CEX (P1.1): PCA clock output. Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are externally being pulled low will source current because of the pull-ups. (See DC Electrical Characteristics: IIL). (Note: P3.5 does not have the strong pullup that is on for 2 oscillator periods.) Port 3 also serves the special function as listed below: ECI (P3.6): External PCA clock input. RxD/T0 (P3.4): Serial port receiver data input. Timer 0 external clock input. INT1: External interrupt 1. TxD/T1 (P3.5): Serial port transmitter data. Timer 1 external clock input. Reset: A high on this pin for two machine cycles while the oscillator is running resets the device. (NOTE: The TPM754 does not have an internal reset resistor.) Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. Crystal 2: Output from the inverting oscillator amplifier. Analog supply voltage and reference input. Analog supply and reference ground. ZIN: Input to analog multiplexer. YIN: Input to analog multiplexer. XIN: Input to analog multiplexer. XYZRAMP: Provides a low impedance pulldown to VSS under S/W control. DECOUPLE: Output from regulated supply for connection of decoupling capacitors. VREG: Provides regulated analog supply output. XYDACBIAS: Provides source voltage for bias of external circuitry. XYSOURCE: Provides source voltage from regulated analog supply. ZDAC: Switchable output from the internal DAC. XYDAC: Non-switchable output from the internal DAC. NAME AND FUNCTION 24 23 P3.0-P3.7 1-4, 25-28 I O I/O 3 1 4 2 RST X1 X2 AVCC AVSS ZIN YIN XIN XYZRAMP DECOUPLE VREG XYDACBIAS XYSOURCE ZDAC XYDAC 1 1 I I I I I I O I I I I I O O O O O O O 5 7 6 14 13 9 10 11 12 15 16 17 18 19 20 NOTE: 1. AVSS (reference ground) must be connected to 0 V (ground). AVCC (reference input) cannot differ from VCC by more than 0.2 V, and must be in the range 4.5 V to 5.5 V. 1999 Nov 11 3 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A OSCILLATOR CHARACTERISTICS X1 and X2 are the input and output, respectively, of an inverting amplifier which can be configured for use as an on-chip oscillator. To drive the device from an external clock source, X1 should be driven while X2 is left unconnected. There are no requirements on the duty cycle of the external clock signal, because the input to the internal clock circuitry is through a divide-by-two flip-flop. However, minimum and maximum high and low times specified in the data sheet must be observed. The DAC is an 8-bit device and its output appears on the XYDAC pin. In addition, the DAC output may also be routed to the ZDAC pin by means of bit AC6 in the ACON0 register. The DAC output is not buffered, so external load impedances should be taken into consideration when using either of these outputs. A 3-input multiplexer is provided, whose output is connected to the positive reference of a comparator. The multiplexer output is controlled by bits MUX2:0 of ACON1. A bandgap reference supplies the negative reference of the comparator. The output of the comparator may be used the trigger the capture input of module 4 of the PCA. A low impedance pulldown is supplied at the XYZRAMP pin and is controlled by bit AC5 of ACON0. The functions of the analog section are controlled by the IBM(R) TrackPointTM code embedded within the Philips TPM754. IDLE MODE The TPM754 includes the 80C51 power-down and idle mode features. In idle mode, the CPU puts itself to sleep while all of the on-chip peripherals except the D/A stays active. The functions that continue to run while in the idle mode are the timers and the interrupts. The instruction to invoke the idle mode is the last instruction executed in the normal operating mode before the idle mode is activated. The CPU contents, the on-chip RAM, and all of the special function registers remain intact during this mode. The idle mode can be terminated either by any enabled interrupt (at which time the process is picked up at the interrupt service routine and continued), or by a hardware reset which starts the processor in the same manner as a power-on reset. Upon powering-up the circuit, or exiting from idle mode, sufficient time must be allowed for stabilization of the internal analog reference voltages before a D/A conversion is started. PC BOARD LAYOUT CONSIDERATIONS The TrackPoint is a low-level analog circuit. While not difficult to implement, careful consideration should be given to circuit board layout to obtain proper operation of the TrackPoint. The considerations are similar to that used for radio frequency application. The circuit should be located far from the CPU and video lines, and should also be shielded from any digital signals. A 100V pulse picked up every 3 or 4 seconds is sufficient to cause cursor drift. A good circuit board layout will result in a circuit that is very stable and will hold the cursor on a pixel for days at a time. However, the autorouters of most software board layout packages will not do an adequate job, and manual routing of this portion of the motherboard is recommended. The TPM754 has excellent supply regulation for the analog portions of the TrackPoint circuit. However, care should be taken with respect to the circuit ground to avoid voltage shifts due to non-TrackPoint loads. The analog part of the circuit must have its own ground plane, isolated from everything else and connected to the main ground at just one point (no ground loops). All of the analog portion of the TrackPoint circuit, and nothing else, must be over this ground island. No digital traces can pass though the analog area on any level from the ground plane out. The circuit should be confined to one side of the ground plane, preferably on the first interior layer, with the ground plane next. The circuit should be powered only at a single point (pin 14), and that power should be filtered to ground before it comes onto the analog area. The signal lines from the TrackPoint sensor stick can be sensitive to pickup, and should be run close together, and not too close to digital lines. A grounded guard trace is a good idea. Most important, the stick common line is not a ground line, but rather a signal line, although it will eventually connect to the analog ground. A common and serious error is to treat it as ground, connecting it to a general ground at some convenient point. The layout should be designed to keep things compact and minimize trace lengths. The whole circuit, analog and digital, will fit comfortably within 2cm x 3cm. In some situations, it may be desirable to put the circuit on a separate card instead of on the motherboard. In this case, a shielded cable should provide the best means of connecting the stick signals to the circuit card. I/O Ports The I/O pins provided by the TPM754 consist of port 1 and port 3. Port 1 Port 1 is a 3-bit bidirectional I/O port and includes alternate functions on some pins of this port. Pins P1.0 and P1.1 are provided with internal pullups while the remaining pin (P1.2) has an open drain output structure. The alternate functions for port 1 are: INT0 - External interrupt 0. CEX - PCA clock output. Port 3 Port 3 is an 8-bit bidirectional I/O port structure. The alternate functions for port 3 are: RxD - Serial port receiver data input. T1 - Timer 1 external clock input. INT1 - External interrupt 1. TxD - Serial port transmitter data. T0 - Timer 0 external clock input. ECI - PCA external clock input. Analog Section The analog section of the TPM754, shown in Figure 1, consists of four major elements: a bandgap referenced voltage regulator, an 8-bit DAC, an input multiplexer and comparator, and a low impedance pulldown device. The bandgap voltage regulator uses the AVCC pin as its supply and produces a regulated output on the VREG pin. The regulator also supplies the analog supply voltage for the DAC. The regulator may be switched on/off by means of the AC1 bit in the analog control register (ACON0). The regulator output may also be supplied to the XYDACBIAS and XYSOURCE pins by means of bits AC3 and AC4, respectively. The DECOUPLE pin is provided for decoupling the regulator output. 1999 Nov 11 4 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A AVCC AC1 DECOUPLE AC2 VREG AC3 XYDACBIAS 20K 10K BANDGAP REF* AC4 XYSOURCE 1K XYDAC DCON 7:0 (84H) ZDAC AC6 ZIN AC7 TO PCA TRIGGER YIN ANALOG MUX XIN BANDGAP REF EXT MUX0 MUX1 MUX2 XYZRAMP AC5 *ENABLED/DISABLED BY AC0 SU00765A Figure 1. Analog Section READ LATCH ALTERNATE OUTPUT FUNCTION VDD INTERNAL* PULL-UP INT. BUS D LATCH Q PIN WRITE TO LATCH CL Q READ PIN ALTERNATE INPUT FUNCTION *PINS LISTED AS OPEN DRAIN WILL NOT HAVE THIS PULLUP SU00671 Figure 2. Typical Port Bit Latches and I/O Buffers 1999 Nov 11 5 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A ABSOLUTE MAXIMUM RATINGS1, 3, 4 PARAMETER Storage temperature range Voltage from VCC to VSS Voltage from any pin to VSS Power dissipation RATING -65 to +150 -0.5 to +6.5 -0.5 to VCC + 0.5 1.0 UNIT C V V W DC ELECTRICAL CHARACTERISTICS Tamb = 0C to +70C, AVCC = 5 V 5, AVSS = 0 V4 VCC = 5 V 10%, VSS = 0 V SYMBOL ICC Inputs VIL VIH VIH1 Outputs VOL VOL1 VOH ILI CIO Output low voltage, port 3, 1.2 Output low voltage, port 1.0, 1.1 Output high voltage, ports 3, 1.0, 1.1 Input leakage current, port 1, 3, RST Pin capacitance IOL = 1.6 mA2 IOL = 3.2 mA2 IOH = -60 A, 0.45 < VIN < VCC Test freq = 1 MHz, Tamb = 25C 2.4 10 10 0.45 0.45 V V V A pF Input low voltage, port 1, 3 Input high voltage, port 1, 3 Input high voltage, X1, RST -0.5 0.2VCC+0.9 0.7VCC 0.2VCC-0.1 VCC+0.5 VCC+0.5 V V V PARAMETER Supply current (see Figure 5) TEST CONDITIONS LIMITS4 MIN TYP1 MAX UNIT NOTES: 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section of this specification is not implied. 2. Under steady state (non-transient) conditions, IOL must be externally limited as follows: 10mA Maximum IOL per port pin: Maximum IOL per 8-bit port: 26mA 67mA Maximum total IOL for all outputs: If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 3. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima. 4. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted. 5. Power-down ICC is measured with all output pins disconnected; X2, X1 n.c.; RST = VSS. 6. ICC is measured with all output pins disconnected; X1 driven with tCLCH, tCHCL = 5 ns, VIL = VSS + 0.5 V, VIH = VCC - 0.5 V; X2 n.c.; RST = VCC. ICC will be slightly higher if a crystal oscillator is used. 7. Idle ICC is measured with all output pins disconnected; X1 driven with tCLCH, tCHCL = 5 ns, VIL = VSS + 0.5 V, VIH = VCC - 0.5 V; X2 n.c.; RST = VSS. 8. Pin 9, 10, 11, and 21; VIN VREG. 1999 Nov 11 6 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A ANALOG SECTION ELECTRICAL CHARACTERISTICS Tamb = 0C to +70C; VCC = 5 V 10%, VSS = 0 V SYMBOL Analog Inputs AVCC IAVCC Analog supply voltage Sensor resistor AC0 = 0 IC only AC0 = 1 Regulator VREG ICHARGE CDECOUPLE RDSONQ1 ILEAKAGEQ1 ILEAKAGEQ2 PSRR MUX and Comparator Comparator trip point MUX impedance ILEAKAGEMUX VIN VREG ZDAC, XYDAC monotonicity ZDAC switch impedance DAC output resistance ZDAC switch leakage Switches XYZRAMP impedance XYZRAMP leakage XYDACBIAS impedance XYDACBIAS leakage XYSOURCE impedance XYSOURCE leakage - -10 - -10 - -10 200 13 33 100 +10 25 +10 400 +70 A A A 1.14 - -10 1.26 1 1.38 4 +10 V k A 100 Hz Decouple current IVREG = 13 mA CDEC = 10 F Stability requirement 3.6 - - - -10 -10 - -40 3.8 60 10 7 4.3 100 - 12 +10 +10 - V mA F A A dB 4.5 330 - - - - 1.2 - 5.5 3K 2.5 10 V mA A PARAMETER LIMITS4 TEST CONDITIONS MIN TYP1 MAX UNIT Digital-to-Analog Conversion 8 - - -10 - 75 2.7 - 200 5 +10 bits k A AC ELECTRICAL CHARACTERISTICS Tamb = 0C to +70C, VCC = 5 V 10%, VSS = 0 V4 VARIABLE CLOCK SYMBOL 1/tCLCL tCHCX tCLCX tCLCH tCHCL Oscillator frequency: PARAMETER MIN 3.5 MAX 12 UNIT MHz External Clock (Figure 3) High time Low time Rise time Fall time 20 20 20 20 ns ns ns ns 1999 Nov 11 7 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A EXPLANATION OF THE AC SYMBOLS Each timing symbol has five characters. The first character is always `t' (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designations are: C - Clock D - Input data H - Logic level high L - Logic level low Q - Output data T - Time V - Valid X - No longer a valid logic level Z - Float VCC -0.5 0.2 VCC + 0.9 0.2 VCC - 0.1 0.45V tCLCX tCHCX tCHCL tCLCL tCLCH SU00297 Figure 3. External Clock Drive VCC -0.5 0.2 VCC + 0.9 0.2 VCC - 0.1 0.45V SU00307 Figure 4. AC Testing Input/Output 20 18 16 14 12 ICC mA 10 8 6 4 2 MAX ACTIVE ICC6 TYP ACTIVE ICC6 MAX IDLE ICC7 TYP IDLE ICC7 4MHz FREQ 8MHz 12MHz SU00739 Figure 5. ICC vs. FREQ Maximum ICC values taken at VCC = 5.5V and worst case temperature. Typical ICC values taken at VCC = 5.0V and 25C. Notes 6 and 7 refer to AC Electrical Characteristics. 1999 Nov 11 8 1999 Nov 11 + SCHEMATIC OF TRACKPOINT SYSTEM Philips Semiconductors Microcontroller with TrackPointTM microcode from IBM +5 +5 C4 2.2uF R8 100K 5% C3 0.1uF + +5 C5 10uF FORCE SENSOR + SEE NOTE 10 R16 X SEE NOTE 10 R1 R15 C1 +5 14 AVCC 15 16 17 18 21 9 10 11 12 DEC U1 +5 22 VCC RST 5 3 28 23 24 2 4 1 6 + TPM754 JMP2 INVERT Y INVERT Z TACTILE SEE NOTE 8 JMP3 SEE NOTE 9 +5 R2 4.7K 5% +5 R3 4.7K 5% CN1 TO SYSTEM BOARD GND 1 COM +5 2 VCC 3 CLK 4 DATA VREG XYDB XYS WIN ZIN YIN XIN RMP XYD ZDAC P3.1 P3.2 P3.0 AVSS 13 P3.6 P3.3 P1.1 INT0 TXD/T1 INT1 RXD/T0 X2 X1 VSS 8 Z or + C6 0.01uF R4 LMC6036 6 C7 0.01uF R23 5 U2 7 2 3 U2 4 1 11 Y +Y -X -Y +X LMC6036 R7 R6 20 19 MID 26 27 25 +5 R10 10K 5% +5 R14 10K 5% CLK DATA MOUSE 6 PIN MINI DIN 5 3 1 2 4 LMC6036 9 C8 0.01uF 10 U2 8 X1 7 12.0MHz X COMMON R24 R11 +5 R18 JMP1 TACTILE FEEDBACK OUTPUT 6 STICK WIRING MAY VARY TYPICAL WIRING SHOWN FOR REFERENCE ONLY LMC6036 13 12 U2 14 R9 BUTTONS BUTTON ASSEMBLY C2 0.01uF 10% OR BETTER TEMPERATURE STABLE 1 2 3 4 COM RIGHT LEFT MIDDLE SEE NOTE 3 9 TYPCIAL TARGET SETTINGS 50 counts per Z DAC step 18 counts per XY DAC step 3.2 grams/count XY 10 grams/count Z SU00815F R5 R17 1 1 1 RIGHT 2 LEFT 2 MIDDLE 2 NOTES: 1. All resistors 1% low noise unless noted. 2. Middle button switch is optional. 3. Jumper JMP1 is only installed when middle button is not present, otherwise it is not populated. 4. Connectors are shown for reference only. 5. Connection between analog and digital ground must be a single point connection close to the TPM754. 6. Component values that are not specified depend upon stick sensitivity, geometry, impedance, and tolerance. 7. TPM754 Reset pin (Pin 5) can be driven by system power on reset signal (active High). Omit C4, R 8 in this case. 8. If Pin 3 is grounded, positive voltage swing on the stick's Y terminal will move the cursor downward (-Y), otherwise upward. 9. If Pin 28 is grounded, positive voltage swing on the stick's terminal will be interpreted as downward (-Z) force, otherwise upward. 10. A Z axis series resistor and a fifth stick terminal may be present. 11. For most current information, see www.ibm.com. Preliminary specification TPM754A Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A SSOP28: plastic shrink small outline package; 28 leads; body width 5.3mm SOT341-1 1999 Nov 11 10 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A NOTES 1999 Nov 11 11 Philips Semiconductors Preliminary specification Microcontroller with TrackPointTM microcode from IBM TPM754A Data sheet status Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. Production [1] Please consult the most recently issued datasheet before initiating or completing a design. Definitions Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1998 All rights reserved. Printed in U.S.A. Date of release: 11-99 Document order number: 9397 750 06577 Philips Semiconductors 1999 Nov 11 12 |
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