11-MD118A Version Issue Date File Name Total Page : A.004 : 2007-08-07 : SP-MD118A-A.004.doc : 20 8-BIT DAC VCM Driver with I2C Interface 新竹市展業一路 9 號 7 樓之 1 SILICON TOUCH TECHNOLOGY INC. 9-4F-3, Prosperity Rd I, Science-Based Industrial Park Hsinchu, Taiwan, R.O.C. Tel：886-3-5727171 Fax：886-3-5727390 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 11-MD118A 8-Bit DAC VCM Driver with I2C Interface General Specifications The 11-MD118A is a VCM driver IC with I2C interface control that is capable of programmable output current sinking. It has a built-in internal voltage reference and operates in a wide supply voltage range from 2.4V to 5.5V. The DAC is controlled by a 2-wire I2C serial interface which operates in I2C fast mode (400 kHz). The 11-MD118A is designed for applications like image stabilization, auto-focus, and optical zoom in camera phones, digital still cameras, and other portable module devices. Features and Benefits z Programmable output current sinking z I2C serial interface z 8-BIT DAC resolution z 2.4V – 5.5V power supply z Low voltage control for digital pin (PD, SDA, SCL) z Power down operation z Power on reset z Constant current control z Ultra small package: WLCSP1(0.84*1.84*0.5 mm), WLCSP2(1.0*2.0*0.45 mm) and DFN10 (3*3*0.8 mm) SP-MD118A-A.004.doc Version：A.004 Page：1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Pin Assignment Pin Assignment of DFN10 (3*3*0.8mm) Pin Descriptions 1. Pin NO. Pin Name Description 1 VDD 2 PD 3 NC 4 VSS 5 NC 6 NC 7 SDA I2C Interface Data 8 SCL I2C Interface Data 9 SEN Analog Output : Programmable FSR Current Sinking 10 SINK Analog Output : Output Current Sink Power Supply Pin Digital Input: Power Down Mode(Low power down, High operation) Ground Pin The I2C slave 7-bit address of 11-MD118A is 0001-1xx. SP-MD118A-A.004.doc Version：A.004 Page：2 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Pin Assignment of WLCSP1 (0.84*1.84*0.5mm) TOP View A B 1 2 3 4 Pin NO. Pin Name Description A1 SEN Analog Output : Programmable FSR Current Sinking A2 PD Digital Input: Power Down Mode(Logic ‘L’: power down) A3 SDA I2C Interface Data A4 SCL I2C Interface Data B4 VSS Ground Pin B3 VSS Ground Pin B2 SINK Analog Output : Output Current Sink B1 VDD IC Power Pin SP-MD118A-A.004.doc Version：A.004 Page：3 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Pin Assignment of WLCSP2 (1.0*2.0*0.45mm) TOP View Pin NO. Pin Name Description WL1 SEN Analog Output : Programmable FSR Current Sinking WL2 PD Digital Input: Power Down Mode(Logic ‘L’: power down) WL3 SDA I2C Interface Data WL4 SCL I2C Interface Data WL5 VSS Ground Pin WL6 VSS Ground Pin WL7 VDD Power Supply Pin WL8 SINK Analog Output : Output Current Sink SP-MD118A-A.004.doc Version：A.004 Page：4 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Absolute Maximum Ratings Unless otherwise noted, TA= 25℃ Characteristic Symbol Rating Unit Supply Voltage VDD 5.5 V Input Voltage VIN VDD+0.4 V Maximum Output Current IOUT 130 mA Operating Temperature Range TOPR -40 ~ 125 °C Storage Temperature Range TSTG -65 ~ 150 °C Electrical Characteristic Unless otherwise noted, TA= 25℃, VDD = 2.8 V and VCM loading = 28.5Ω Item Sym. Limit Condition Unit Min. Typ. Max. 2.4 2.8 5.5 V Power Supply Supply Voltage VDD Supply Current IPD PD = L (Power down mode) - - ±0.5 uA ( IDD ) IDD PD = H (Operation mode) - 3.5 4 mA PD, SDA, SCL digital control pin Input Voltage “H” VIH - 0.6*VDD - VDD+0.4 V Input Voltage “L” VIL - -0.4 - 0.2*VDD V Parameters Resolution 8 Bits INL ±0.8 ±1 LSB DNL ±0.8 ±1 LSB 5 7 mA Zero Code Error IOS @ RSEN = 3.3 Ω Full Scale Voltage VFSR Voltage on the SEN Pin 360 380 400 mV Least Significant Bit LSB @ RSEN = 3.3 Ω 0.42 0.44 0.46 mA 120 200 μs 0.1 0.15 V VDD = 2.8V, CL=1 μ F , Output Current Settling Time ts @ RSEN = 3.3 Ω, VCM( 28.5 Saturation Voltage SP-MD118A-A.004.doc VSAT Ω, 460μ H ) IOUT = 120 mA Version：A.004 - Page：5 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Block Diagram (DFN10) PD VDD 2 1 Voltage Reference SCL 8 I2C Interface SDA DAC Output Driver 10 7 4 9 VSS SEN SP-MD118A-A.004.doc Version：A.004 Page：6 SINK 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Terminology Resolution The DAC resolution is defined by the number of distinct analog levels corresponding to the number of bits it uses. 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. Zero-Code Error Zero-Code error is the output error as the bits ‘0000-0000-00’ are loaded into DAC register. Full Scale Voltage Full scale voltage is the maximum output voltage of the I2C DAC (SEN pin) as the bits ‘1111-1111-00’ are loaded into 11-MD118A. Sink Current Sink Current is the input current driven by the power MOS embedded in the 11-MD118A. SP-MD118A-A.004.doc Version：A.004 Page：7 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Data Format 11-MD118A Write Mode When in the write mode, data is written to the 11-MD118A and shifted step-by-step into the 16-bit input register. When all data has been loaded in and master signal receives a STOP condition, the loaded data in the input register is transferred to the DAC. 11-MD118A Read Mode When 11-MD118A is in the write mode, data is read back from IC to master in the same bit order. SP-MD118A-A.004.doc Version：A.004 Page：8 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 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 z SPD (Soft Power Down, 2nd standby mode): L is for IC active, and H just reset the DAC registers (D9~D0 -> 0) without shutdown analog cells for fast rising speed of output constant current. Regarding to all kinds of IC operation situations please refers to following table. PD SPD IC status L - Power down H L IC Active H Soft power down z X denotes “Don’t care/Unused”. z D(n), n = 2~9, are for 8-bit DAC data programming while D1 and D0 are forced to logic 0 assignment in order to guarantee 8-bit DAC resolution. The diagram shows the example of write mode. SP-MD118A-A.004.doc Version：A.004 Page：9 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Performance Characteristic 1. Typical DNL Plot Typical DNL Plot @VDD=2.8V, 25degree 1 0.8 0.6 DNL (LSB) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 50 100 150 200 250 200 250 DIGITAL Code 2. Typical INL Plot Typical INL Plot @VDD=2.8V, 25degree 1 0.8 0.6 0.4 INL (LSB) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 50 100 150 DIGITAL Code SP-MD118A-A.004.doc Version：A.004 Page：10 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3. Output Sink Current Plot Isink vs. DAC code @ different temperatures 110 100 90 80 Isink (mA) 70 60 -40 degree 25 degree 80 degree 50 40 30 20 10 50 100 150 200 250 DIGITAL Code 4. Maximum Settling Time ( Which is current of SINK, ISINK, from 0 to maximum constant current) SP-MD118A-A.004.doc Version：A.004 Page：11 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 5. Saturation voltage (ISINK@120mA) 11-MD118A VDD = 2.8V Vsat (mV) Iout (mA) SP-MD118A-A.004.doc Version：A.004 Page：12 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Application Circuit Compensation Capacitor CL= 1 F VCM VDD 10 F Rp IL Rp 1 11-MD118A SDA SCL I2C MASTER DEVICE 7 10 VDD SINK Output Driver I2C Interface 8-BIT DAC 8 VSS PD I2C SLAVE DEVICE 2 SEN 4 9 RSEN PD = L (power down mode) PD = H (IC operation) The Least Significant Bit (LSB) driving current of Voice Coil Actuator is determined by RSEN. For example, RSEN= 3.3Ω. The Full Scale Voltage (VFSR) of SEN is 365mV and the Zero Code Error (IOS) is 5mA. The LSB driving current of Voice Coil Actuator is . If input digital code is 0111-1111-00 (D9~D2 can be programmable, and D1~D0 are forced to logic 0). The driving current of Voice Coil Actuator (IL) is I L = I OS + code * LSB = 5mA + 127*414uA ≅ 57.6mA SP-MD118A-A.004.doc Version：A.004 Page：13 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Application Notes z The 11-MD118A is a constant current control IC for application in Auto-Focus. The supply voltage range VDD of 11-MD118A 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 “H” is from 0.6*VDD to VDD+0.4V and logic “L” is from –0.4V to 0.2*VDD. z The PD pin is the enable pin of 11-MD118A. Logic high level (PD = H) is for IC operation. On the other hand, its logic low level (PD = L) puts the chip into power down mode for power saving. It is recommended to keep PD at low level (PD = L) before operation to reach the maximum efficiency of power saving, especially for applications in portable devices. z In order to ensure the stability of output current, a compensation capacitance CL is suggested to be placed across the two terminals of VCM. The suggested value of CL is about 1uF and could be fine tuned for different VCM. The idea is to use frequency response compensation to ensure stability when VCM is operating. z In order to guarantee 8-bit DAC resolution, DAC data, D1 and D0 are set to logic 0 only. There are 8-bit DAC data, D9~D2, are used for VCM constant current control via the two I2C serial data lines, SCL and SDA. If all 10 bits are used for DAC programming in an attempt to reach 10-bit DAC resolution, the DNL might get larger than 1 LSB due to glitch effect. In order to guarantee output current monotonically increases as the DAC code increases, it is suggested to utilize only 8-bit data programming to reach a better performance. z The exposed paddle on the 11-MD118A should be soldered to ground to ensure the optimal thermal dissipation performance. SP-MD118A-A.004.doc Version：A.004 Page：14 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. z IC packaging(WLCSP2) Power Dissipation The power consumption of IC varies widely with supply voltage, output current, and actuator loading. It is important to ensure the application does not exceed the allowable power dissipation of the IC package. The recommended Power De-rating Curve, power dissipation versus ambient temperature is depicted as follows. The work is done under JEDEC51-9. Power De-rating Curve Power Dissipation (mW) 1200 1000 800 600 400 200 0 0 10 20 30 40 50 60 70 80 90 Ambient Temp. TA(oC) SP-MD118A-A.004.doc Version：A.004 Page：15 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Package Specification (DFN-10) SYMBOL A A1 A3 b D D1 E E1 L e e1 MIN. 0.70 0.00 0.18 2.90 2.10 2.90 1.10 0.45 SP-MD118A-A.004.doc 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 MIN. 28 0 0.30 3.10 2.30 3.10 1.30 0.65 7 114 83 114 86 18 Version：A.004 DIMENSION (mil) NOM. 30 0.8 8 REF 10 118 87 118 87 22 20 BASIC 79 BASIC MAX. 32 2 12 122 91 122 91 26 Page：16 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Package Specifications (WLCSP1) (size: 0.84*1.84*0.5 mm) Top View E B1 A1 b A2 B2 A3 B3 A4 B4 L2 e2 DIMENSION (mm) SYMBOL A A1 S b D E e1 e2 L1 L2 SP-MD118A-A.004.doc MIN. 0.445 0.17 0.275 0.24 1.79 0.789 0.295 0.195 NOM. 0.50 0.2 0.300 0.26 1.84 0.839 0.4 0.4 0.320 0.220 Version：A.004 MAX. 0.555 0.23 0.325 0.28 1.89 0.889 0.345 0.245 Page：17 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Package Specifications (WLCSP2) (size: 1.0*2.0*0.45 mm) Top View E WL8 WL1 b WL2 WL7 WL3 WL6 WL4 WL5 L2 e2 DIMENSION (mm) SYMBOL A A1 A2 b D E e1 e2 L1 L2 SP-MD118A-A.004.doc MIN. 0.40 0.08 0.32 0.26 1.95 0.95 0.48 0.48 0.22 0.22 NOM. 0.45 0.10 0.35 0.28 2.00 1.00 0.50 0.50 0.25 0.25 Version：A.004 MAX. 0.50 0.12 0.38 0.30 2.05 1.05 0.52 0.52 0.28 0.28 Page：18 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 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. SP-MD118A-A.004.doc Version：A.004 Page：19