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EMC1212 BBUS Compliant Dual Temperature Monitor with Beta Compensation
PRODUCT FEATURES
GENERAL DESCRIPTION The EMC1212 is a temperature sensor that communicates with a host over a single-wire SMSC BudgetBusTM Sensor Interface. The EMC1212 monitors one internal diode and one remote temperature zone. Packaged in a SOT23-5, the EMC1212 provides an accurate, low-cost, low-current, solution for critical temperature monitoring in applications such as embedded systems or computers. When used in combination with an SMSC Super I/O host, such as a keyboard controller, a complete thermal management system is created. A power down mode extends battery life in portable applications. The internal 11-bit sigma delta temperature-to-digital converter provides superb linearity, high accuracy and excellent noise immunity. The EMC1212 is designed to operate with 65nm or 90nm PNP substrate transistor used as a thermal diode with the collector connected to ground. APPLICATIONS Desktop and Notebook Computers Hardware Management FEATURES Single Wire BBUS Interface Resistance Error Correction Beta Compensation External Temperature Monitor
-- 0.125C resolution -- 1C Accuracy 60C to 100C -- Diode Fault Reporting
Datasheet
Internal Temperature Monitor
-- Range 0C to +85C -- 0.125C resolution -- 1.5C Accuracy 50C to 70C
Supply:
-- 3.0V to 3.6V -- <5uA in Standby
SIMPLIFIED BLOCK DIAGRAM
EMC1212
Switching Current Local Temp Diode
DP DN
Beta Comp & REC
Analog Mux and anti-aliasing filter
11-bit delta-sigma ADC
Temperature Registers
BBUS Interface
BBUS
SMSC EMC1212
DATASHEET
Revision 1.1 (02-07-07)
BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
ORDER NUMBER(S): EMC1212-AGZQ-TR FOR 5 PIN, SOT LEAD-FREE ROHS COMPLIANT PACKAGE REEL SIZE IS 2,500 PIECES EVALUATION BOARD AVAILABLE UPON REQUEST (EVB-KBC1100)
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright (c) 2007 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC's website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation ("SMSC"). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
Chapter 1 Pin Description
VDD GND BBUS
1 2 3
5
DN
4
DP
Figure 1.1 Pin Diagram for EMC1212 Table 1.1 Pin Description
PIN NUMBER 1 2 3 4 5 VDD GND BBUS DP DN NAME Supply Voltage Ground Serial bus interface to SMSC host Remote diode positive terminal Remote diode negative terminal FUNCTION
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Chapter 2 Electrical Specifications
2.1 Absolute Maximum Ratings
Table 2.1 EMC1212 Maximum Ratings DESCRIPTION Supply Voltage VDD Voltage on any other pin to GND Operating Temperature Range Storage Temperature Range Lead Temperature Range Package Thermal Characteristics for SOT23-5 Power Dissipation Thermal Resistance(at 0 air flow) ESD Rating, All Pins Human Body Model TBD 131.7 2000 C/W V RATING -0.3 to 5.0 -0.3 to VDD +0.3 0 to 85 -55 to 150 Refer to JEDEC Spec. J-STD-020 UNIT V V C C
Note: Stresses above those listed could cause damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used.
2.2
Electrical Specifications
VDD = 3.3V 10% TA = 0C to 85C, all Typical values at TA = 27C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
DC Power Supply Voltage Supply Current Supply Current VDD IDD IDD 3 3.3 700 2 3.6 1000 5 V uA uA Active Mode Standby Mode
Internal Temperature Monitor Temperature Accuracy 1 3 1.5 Temperature Resolution 0.125 C C C 50C < TA < 70C
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
External Temperature Monitor Temperature Accuracy 0.5 1 Temperature Resolution Conversion Time per Channel Capacitive Load tCONV CLOAD 0.125 21 400 1 3 C C C mS pF Connected across remote diode 60C < TDIODE < 100C, 10C < TA < 70C 0C < TDIODE < 125C
2.3
BudgetBus Electrical Characteristics
VDD = 3V to 3.6V, TA = 0C to 85C, Typical values are at TA = 27C unless otherwise noted.
CHARACTERISTIC Output High Voltage Output Low Voltage Input High Voltage Input Low Voltage
SYMBOL VOH VOL VIH VIL
MIN 2.4
TYP
MAX
UNITS V
CONDITIONS 2mA Sourcing current 4mA Sinking Current
0.4 2.4 0.4 AC Parameters
V V V
Input Capacitance Bus Single Bit High Time or Low Time Inactive Time Power Down Time Rise Time Fall Time
CIN THIGH / TLOW TINACTIVE TPWRDN TRISE TFALL 8 132 264 10
10 12
pF us us us Between Consecutive packets or after power up To initiate power down
400 400
ns ns
2.4
BudgetBus Protocol
The EMC1212 communicates with a host controller, such as the SMSC KBC1100, through the proprietary single wire SMSC BudgetBusTM Sensor Interface known as BBUS. The BBUS is a single wire serial communication protocol between the computer host and its peripheral devices. Please refer to the BBUS Specification for detailed information about the modes of operation. The BudgetBus timing is shown in Figure 2.1. This timing applies to all BudgetBus communication bits.
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
tRISE
tFALL
'0' tINACTIVE tPWRDN tLOW
'1' tHIGH
Figure 2.1 BudgetBus Bit Timing
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
Chapter 3 Product Description
The EMC1212 is a SOT23 temperature sensor with a proprietary single wire SMSC BudgetBusTM Sensor Interface. Temperature information is communicated to a host device via the serial bus. All intelligence regarding the interpretation of temperature resides in the host. The EMC1212 monitors an internal diode and single external transistor and automatically corrects for errors induced by series resistance and beta variation. Figure 3.1 shows a typical system overview:
EMC1212 DP DN BBUS
Host (e.g. KBC1122)
BBUS Interface
Figure 3.1 System Diagram of EMC1212
Thermal management consists of the host acquiring the temperature data from the EMC1212 and controlling the speed of one or more fans. Because the EMC1212 incorporates one internal and one external temperature diode, up to two separate thermal zones can be monitored and controlled. The host has the ability to compare measured temperature levels to preset limits and take the appropriate action when values are found to be out of limit.
3.1
Power Modes
The EMC1212 has two basic modes of operation that are controlled entirely by the host device. Standby Mode: The host can initiate standby mode by actively pulling the BBUS low. When the Host places the device in standby mode, the device immediately powers down to draw < 2uA of supply current. It will remain in this state until it is awakened by the host. If the host pulls the BBUS line low while temperature data is being clocked out, the device will not enter standby mode until completion of the data transfer. After entering standby mode, the device will remain in this mode until it is forced into active mode by the host. The transition from standby to active mode occurs when the host is no longer pulling the BBUS low. Active Mode: The host initiates active mode by enabling a weak pull up on the BBUS. In this mode, the EMC1212 continuously converts temperature data. During the time that the device is actively converting a temperature, the BBUS is in tri-state mode, and the Host places a weak pull-up on the bus to prevent it from floating. After a conversion is completed, the device automatically clocks out the data from the most recent conversion to the host. When the data packet has been entirely clocked out, the BBUS returns to tri-state mode, and the ADC begins converting the next temperature sample. While BBUS is in tri-state mode, the host can command the device to standby mode.
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
3.2
Temperature Monitor
Thermal diode temperature measurements are based on the change in forward bias voltage of a diode when operated at two or more different currents.
where:
VBE = VBE _ HIGH - VBE _ LOW
I ln HIGH = I q LOW
kT

k = Boltzmann's constant T = absolute temperature in Kelvin q = electron charge
= diode ideality factor
As can be seen in this equation, the delta VBE voltage is directly proportional to temperature. Figure 3.2 shows a block diagram of the temperature monitoring circuitry. The delta VBE is first sampled at an effective rate of 3.125kHz and then measured by the internal 11 bit delta sigma ADC. The advantages of this architecture over Nyquist rate FLASH or SAR converters are superb linearity and inherent noise immunity. The linearity can be directly attributed to the delta sigma ADC single bit comparator while the noise immunity is achieved by the 20.75ms integration time. The input bandwidth of the system is fs/2048, this translates to 50Hz at a 100kHz clock frequency.
IHIGH
ILOW
CPU substrate PNP
Beta Compensation Circuitry
Resistance Error Correction
Input Filter & Sampler
11-bit delta-sigma ADC
Figure 3.2 Block Diagram of Temperature Monitoring
The temperature data format is an offset 2's complement with a range of -64C to +191.875C as shown in Table 3.1.
Table 3.1 EMC1212 Temperature Data Format
2'S COMPLEMENT FORMAT TEMPERATURE (C) Diode Fault or -64 -63.875 -63 -1 0 BINARY 100 0000 0000 100 0000 0001 100 0000 1000 110 1111 1000 110 0000 0000 400h 401h 408h 6F8h 600h HEX
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
Table 3.1 EMC1212 Temperature Data Format (continued)
2'S COMPLEMENT FORMAT TEMPERATURE (C) 1 63 64 65 128 191 191.875 BINARY 110 0000 1000 111 1111 1000 000 0000 0000 000 0000 1000 010 0000 0000 011 1111 1000 011 1111 1111 608h 7F8h 000h 008h 200h 3F8h 3FFh HEX
The external diode supported by the EMC1212 must be connected as shown in Figure 3.3. The EMC1202 availabe from SMSC will support other diode configurations.
to DP to DN
Local Ground Typical remote substrate transistor i.e. CPU substrate PNP
Figure 3.3 External Diode Configuration
3.3
Resistance Error Correction
The EMC1212 includes resistance error correction implemented in the analog front end of the chip. Resistance error correction is an automatic feature that eliminates the need to characterize and compensate for the series resistance in the external diode lines. When using a temperature sensor that does not include resistance error correction, voltage developed across the parasitic resistance in the remote diode path produces an error in the reported temperature. The error introduced by this resistance is approximately 0.7C per ohm. Sources of series resistance are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk resistance in the base and emitter of the temperature transistor.
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
3.4
Beta Compensation
The beta compensation circuitry corrects for beta variation in PNP substrate transistors used as thermal diodes. The EMC1212 is designed to work with 65nm processors manufactured by Intel. For discrete transistors connected with collector to base as a diode, the beta is generally sufficiently high to make this relative beta variation very small (a variation of 10% from low current to high current when beta = 50 contributes approximately 0.25C error at 100C). However, for substrate transistors where the VBE junction is used for temperature measurement and the collector is tied to the substrate, the proportional beta variation causes more error (a variation of 10% from low current to high current when beta = 0.5 contributes approximately 8.25C at 100C). Because the beta compensation circuit is designed to work with PNP substrate transistors, the EMC1212 should not be used with diode-connected transistors (such as the 2N3904) or CPUs that implement the thermal diode as a two-terminal diode. The beta compensation circuit is not present in the EMC1202 availabe from SMSC, and this device is an excellent companion to AMD CPUs.
3.5
Conversion Rate
The conversion rate is fixed to the value given in Section 2.2, but conversions may be halted by periodically placing the device in standby as described in Section 3.1, "Power Modes".
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BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
Chapter 4 Typical Operating Curves
To be determined based on characterization.
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Chapter 5 Package Drawing
R EV IS IO N HISTO R Y
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Datasheet
BBUS Compliant Dual Temperature Monitor with Beta Compensation
D
3 S EE D E T AIL "A "
4
R E VI S ION A
D E S CR IP TION INITIA L R E LE A S E
D A TE 7 /07 /0 4
R E LE A S E D B Y S .K .ILIE V
6
N
3
E1
E
1 IN D E X A R EA (D /2 x E 1/2)
2
3
e
5X b
2
4
c
4
5
T O P V IEW
E N D VIEW
H
C A2 A
G A U G E P LA N E
0 .2 5 NOT ES: 1. "N " IS T H E T O T A L N U M BER O F LEAD S . 2 . T R U E P O S IT IO N S P R E A D T O L E R A N C E IS 0 .10 m m A T M AXIMU M MAT ER IAL C O N D ITIO N . 3 . P A C K A G E B O D Y D IM E N S IO N "D " D O E S N O T IN C LU D E M O LD FLASH , PR O TR U SIO N S O R G A T E B U R R S . M A X IM U M M O LD F LA S H , P R O T R U S IO N S O R G AT E BU R R S IS 0.25 m m PER E N D . D IM E N S IO N "E 1" D O E S N O T IN C L U D E IN T ER LEAD F LAS H O R PR O T R U SIO N . M A X IM U M IN T E R LE A D F LA S H O R P R O T R U S IO N IS 0 .25 m m PER SID E. "D 1" & "E1" D IM E N S IO N S A R E D E T E R M IN E D AT D ATU M P LAN E "H ". 4 . D IM E N S IO N S "b " & "c " A P P L Y T O T H E F LA T S E C T IO N O F TH E LE AD BET W EE N 0.08 T O 0 .15 m m F R O M T H E LEAD TIP. 5 . D E T A ILS O F P IN 1 ID E N T IF IE R A R E O P T IO N A L , B U T M U ST BE LO C AT ED W ITH IN TH E IN D E X A R E A IN D IC A T E D (SEE TO P VIEW ). 6 . F IV E L E A D P A C K A G E IS A V E R S IO N O F 6 L E A D P A C K A G E, W H ER E LEAD #5 H AS BEEN R E M O V E D F R O M 6 L EAD PAC KAG E.
S EA TIN G P LA N E
A1 c cc C L1 L 0
S ID E V IEW
D E T A IL "A " (S C ALE: 2/1)
UN LE S S O THE RW IS E S PE CIFIE D D IM E NS I ONS AR E IN M ILL IM E TE RS A ND TO LE R ANC E S A RE : D E CIM A L 0.1 X .X 0.05 X .X X X .X X X 0.025 A NG UL A R 1
T HIRD A NG LE P RO JE CT IO N
8 0 A R KA Y DRIV E H A UP PA U GE , NY 11 788 US A
T ITLE
D IM A ND TO L P ER A S M E Y 14 .5M - 19 94
M AT E R IAL
N AM E
D RA W N
D ATE
N = 5 L EAD S
N = 6 LE AD S
F IN ISH
-
S .K .IL IEV
C HE CK ED
7 /06 /0 4
D WG N UMBER
P A CK A G E O U T LINE : 5/6 P IN S O T 1 .6 m m B O D Y W IDT H, 0 .95m m P ITC H M O -5/6 S O T -2.9x1.6
S T D C O M PLIANCE S H E ET R EV
3-D V IEW S
S .K .IL IEV
A P P R O VED
7 /06 /0 4
S CA LE
A 1 OF 1
P RIN T W ITH "S CA L E T O FIT" DO N OT S CA LE D RA W ING
S .K .IL IEV
7 /07 /0 4
1:1
JE D E C : M O -1 78 / A A, A B
Figure 5.1 EMC1212 Package Outline and Parameters
BBUS Compliant Dual Temperature Monitor with Beta Compensation Datasheet
5.1
Package Markings
All devices will be marked on the top side with "212" and a lead free symbol. On the bottom, they will be marked with YYWW (2 digits for work week, 2 digits for year)
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