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11-VM148
Version Issue Date File Name Total Page : A.001 : 2009-05-19 : SP-VM148-A.001.doc : 17
130mA, 10Bit Current Sinking VCM Driver with I2C Interface
9 7 1 SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Rd I, Science-Based Industrial Park Hsin-Chu, Taiwan 300, R.O.C. Tel886-3-5645656 Fax886-3-5645626

SILICON TOUCH TECHNOLOGY INC.
11-VM148
130mA, 10-Bit Current Sinking VCM Driver with I2C Interface
General Specifications
The 11-VM148 is a VCM(Voice Coil Motor) driver IC with I2C interface control that is capable of programmable sinking output current. It has a built-in internal voltage reference and operates with a supply voltage range from 2.4V to 5.5V. The DAC is controlled by a signal transmit through a 2-wire I2C serial interface which operates in an I2C fast mode (400 kHz). The 11-VM148 is designed for applications such as image stabilization, auto-focus, optical zoom in camera phones, and other portable module devices.
Features and Benefits
Programmable sinking output current I2C serial interface DAC with 10-BIT resolution 2.4V - 5.5V power source Low voltage control for digital pin PD, SDA, and SCL(i.e., VIH = 1.54V @ VDD = 2.8V) Power off operation Automatic power on reset Small package: DFN10 (3*3*0.8 mm), WLCSP(0.99*1.87*0.5 mm)
Ordering Information
Part Number 11-VM148 WLCSP 11-VM148 DFN *XX reserved for a data code **XXXX reserved for a date code Package WLCSP, 8Pin DFN, 10Pin Marking GXX* or HXX* XXXX**G
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Terminology
Resolution The DAC resolution is defined by the power factor of 2, which defines the number of distinct analog levels. N-bit resolution -> 2N distinct analog levels Differential Nonlinearity (DNL) error The variation in analog step sizes away from 1 LSB by any two adjacent codes. Usually, gain and offset errors have been removed. Integral Nonlinearity (INL) It is the deviation of actual transfer response from a straight line. Usually, INL error is referred to as the maximum INL error.
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Pin Assignment
Pin Assignment of DFN10 (3*3*0.8 mm)
Pin Descriptions
Pin NO. 1 2 Pin Name VDD PD Description Input Power Pin Digital Input: Power off Mode (When PD=High ,chip disable) ( When PD=Low ,chip enable) 3 4 5 6 7 8 9 10 1. NC VSS NC NC SDA SCL MVSS SINK I2C Interface Data(Serial Data Line) I2C Interface Data(Serial Clock Line) Input Motor driver GND Pin Analog Output : Output current Sink Pin Input Ground Pin
The 7 address bits of 11-VM148 for I2C slave true port is 0001-1xx. Version001 Page3
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Pin Assignment of WLCSP (0.99*1.87*0.5mm)
TOP View
Pin Number
Pin Name SINK
Description
1 2 3 4 5 6 7
Analog Output : Output Current Sink Pin Input Motor Driver GND Pin I2C Interface Data(Serial Clock Line) I2C Interface Data(Serial Data Line) Input Ground Pin Input Ground Pin Digital Input: Power off Mode (When PD=High ,chip disable) ( When PD=Low ,chip enable)
MVSS
SCL SDA VSS VSS
PD
8
VDD
Input Power Pin
Absolute Maximum Ratings
Unless otherwise noted, TA= 25 Characteristic Supply Input Voltage Input Voltage Maximum Sink Current Operating Temperature Range Storage Temperature Range Symbol VDD VIN ISINK TOPR TSTG Rating 5.5 VDD+0.4 150 -40 ~ 125 -65 ~ 150 Unit V V mA C C
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Electrical Characteristic
Unless otherwise noted, TA= 25, VDD = 2.8 V and VCM 18, 460uH. Item Power Supply Supply Voltage Supply Current ( IDD ) VDD IPD IDD IDD1 VIH VIL PD = High (chip disable) PD = Low, SPD= High PD = Low, SPD= Low 2.4 2.8 5 0.5 0.1 0.5 V uA mA mA Sym. Condition Limit Min. Typ. Max. Unit
PD, SDA, SCL digital control pin Input Voltage High Input Voltage Low Parameters DAC Resolution DNL INL Output Offset Current Current Slew Rate Output Constant Current Settling Time Voltage Drop Note: (*1) SR = I / t , ISINK is the current of sink pin IOS SR ts PD = L, SPD= logic H 10 +/-0.8 +/-1 +/-1 +/-5 5 3 40 80 Bits LSB LSB uA mA/us us 0.55*VDD -0.4 VDD+0.4 0.2*VDD V V
SR = I / t (*1)
VDD = 2.8V, ISINK = 100mA
V
V = VSINK - VMVSS (*2)
(@ISINK = 80 mA)
-
0.32
0.35
V
(*2): VSINK is the voltage of sink pin and VMVSS is the voltage of motor driver GND pin
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Block Diagram
(DFN10)
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Data Format
11-VM148 Write Mode When in the write mode, data is written to the 11-VM148 and shifted byte-by-byte into a 16-bit input register. After all 16 bits of data have been shifted in, a STOP condition is transmit by master and the loaded data in the input register is transferred to the DAC.
11-VM148 Read Mode When 11-VM148 is in the read mode, data is read from IC to a master controller in the same bit order.
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Table MSB LSB 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Serial Data Bits 7 Input Register R15 R14 R13 R12 R11 R10 R09 R08 R07 R06 R05 R04 R03 R02 R01 R00 SPD X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X Function
SPD (Soft Power off, 2nd standby mode): IC power off controlled by software. X denotes "Don't care/Unused". Regarding to all kinds of IC operation situations please refers to following table. PD High SPD Low Low High Soft power off IC status Power off IC Active
The PD pin is the power off pin of 11-VM148. Logic low level (PD = Low) is for IC operation. On the other hand, its logic high level (PD = High) puts the chip into power off mode for power saving. It is recommended to keep PD at high level (PD = H) before while the chip is no operation to save power, especially for applications in portable devices.
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Performance Characteristics
1. DNL Plot
Typical DNL Plot @VDD=2.8V, 25degree
2
1.5
1
0.5 DNL (LSB)
0
-0.5
-1
-1.5
-2
100
200
300
400
500 DIGITAL Code
600
700
800
900
1000
2. INL Plot
Typical INL Plot @VDD=2.8V, 25degree
2
1.5
1
0.5 INL (LSB)
0
-0.5
-1
-1.5
-2
100
200
300
400
500 DIGITAL Code
600
700
800
900
1000
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3. Settling Time (VDD = 2.8V, VCM = 27Ohm with 430uH@500Hz, 550uH@1kHz, respectively, CL = 0.1uF @Temp. = 25)
4. Sink Current vs. Codes vs. Temp.
Isink vs. Codes vs. Temp.
140
120
100
Isink (mA)
80
60
40
20
Temp. = -40 Temp. = 25 Temp. = 85 100 200 300 400 500 DIGITAL Code 600 700 800 900 1000
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5. Full-Scale Programmable Current vs. Temp. vs. VDD
Full-Scale Current vs. VDD vs. Temp.
Temp. = -40 Temp. = 25 Temp. = 85 150
160
Full Scale Programmable Current (mA)
140
130
120
110
100 -40
-20
0
20
40
60
80
Temp.
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Application Circuit
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Application Notes
The 11-VM148 is a constant current driving IC for applications in Auto-Focus. The supply voltage range VDD of 11-VM148 is from 2.4V to 5.5V. The input range of digital control pin PD, and digital I/O pins SCL and SDA, are defined such that logic "High" is from 0.55*VDD to VDD+0.4V and logic "Low" is from -0.4V to 0.2*VDD. Therefore, the three digital pins are suitable controlled by 1.8V ISP. The PD pin is the power off pin of 11-VM148. Logic low level (PD = Low) is for IC operation. On the other hand, its logic high level (PD = High) puts the chip into power off mode for power saving. It is recommended to keep PD at high level (PD = H) before while the chip is no operation to save power, especially for applications in portable devices. In order to ensure the stability of output current, a compensation capacitance CL is suggested placing across the two terminals of VCM. The suggested value of CL is about 0.1~0.22uF and could be fine tuned for different VCM.
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Package Specification (DFN-10)
SYMBOL A A1 A3 b D D1 E E1 L e e1
SP-VM148
MIN. 0.70 0.00 0.18 2.90 2.10 2.90 1.10 0.45
DIMENSION (mm) NOM. 0.75 0.02 0.203 REF 0.25 3.00 2.20 3.00 1.20 0.55 0.50 BASIC 2.00 BASIC
MAX. 0.80 0.05 0.30 3.10 2.30 3.10 1.30 0.65
MIN. 28 0 7 114 83 114 86 18
DIMENSION (mil) NOM. 30 0.8 8 REF 10 118 87 118 87 22 20 BASIC 80 BASIC
MAX. 32 2 12 122 91 122 91 26
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Package Specifications (WLCSP)
Bottom View
E
D
A2
L2 e2
A1
SYMBOL A A1 A2 b D E e1 e2 L1 L2 MIN. 0.445 0.17 0.275 0.24 1.83 0.95 0.160 0.220
DIMENSION (mm) NOM. 0.5 0.20 0.30 0.26 1.87 0.99 0.50 0.50 0.185 0.245 MAX. 0.555 0.23 0.325 0.28 1.91 1.03 0.210 0.270
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A
L1
e1
b
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The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation.
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