MD118A [SITI]
8-BIT DAC VCM Driver with I2C Interface; 8位DAC VCM驱动器，带有I2C接口
| 型号： | MD118A |
| 厂家： | 
SILICON TOUCH TECHNOLOGY INC. |
| 描述： | 8-BIT DAC VCM Driver with I2C Interface |
| 文件： | 总20页 (文件大小：510K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
11-MD118A
Version
: A.004
Issue Date
File Name
Total Page
: 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
z
z
z
z
z
z
z
z
Programmable output current sinking
I2C serial interface
8-BIT DAC resolution
2.4V – 5.5V power supply
Low voltage control for digital pin (PD, SDA, SCL)
Power down operation
Power on reset
Constant current control
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
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Pin Assignment
Pin Assignment of DFN10 (3*3*0.8mm)
Pin Descriptions
Pin NO.
Pin Name
VDD
PD
Description
1
2
Power Supply Pin
Digital Input: Power Down Mode(Low power down, High operation)
3
NC
4
VSS
NC
Ground Pin
5
6
NC
7
SDA
SCL
SEN
SINK
I2C Interface Data
8
I2C Interface Data
9
Analog Output : Programmable FSR Current Sinking
Analog Output : Output Current Sink
10
1. The I2C slave 7-bit address of 11-MD118A is 0001-1xx.
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Pin Assignment of WLCSP1 (0.84*1.84*0.5mm)
TOP View
A
B
1
2
3
4
Pin NO.
A1
Pin Name
SEN
Description
Analog Output : Programmable FSR Current Sinking
Digital Input: Power Down Mode(Logic ‘L’: power down)
I2C Interface Data
A2
A3
A4
B4
B3
B2
B1
PD
SDA
SCL
VSS
VSS
SINK
VDD
I2C Interface Data
Ground Pin
Ground Pin
Analog Output : Output Current Sink
IC Power Pin
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點晶科技股份有限公司
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Pin Assignment of WLCSP2 (1.0*2.0*0.45mm)
TOP View
Pin NO.
WL1
Pin Name
SEN
Description
Analog Output : Programmable FSR Current Sinking
Digital Input: Power Down Mode(Logic ‘L’: power down)
I2C Interface Data
WL2
WL3
WL4
WL5
WL6
WL7
WL8
PD
SDA
SCL
VSS
VSS
VDD
SINK
I2C Interface Data
Ground Pin
Ground Pin
Power Supply Pin
Analog Output : Output Current Sink
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Absolute Maximum Ratings
Unless otherwise noted, TA= 25℃
Characteristic
Supply Voltage
Symbol
VDD
Rating
5.5
Unit
V
Input Voltage
VIN
VDD+0.4
130
V
Maximum Output Current
Operating Temperature Range
Storage Temperature Range
IOUT
mA
°C
°C
TOPR
TSTG
-40 ~ 125
-65 ~ 150
Electrical Characteristic
Unless otherwise noted, TA= 25℃, VDD = 2.8 V and VCM loading = 28.5Ω
Limit
Typ.
Item
Sym.
Condition
Unit
Min.
Max.
Power Supply
Supply Voltage
Supply Current
( IDD
VDD
IPD
2.4
2.8
-
5.5
±0.5
4
V
PD = L (Power down mode)
PD = H (Operation mode)
-
-
uA
mA
)
IDD
3.5
PD, SDA, SCL digital control pin
Input Voltage “H”
Input Voltage “L”
VIH
VIL
-
-
0.6*VDD
-0.4
-
-
VDD+0.4
0.2*VDD
V
V
Parameters
Resolution
INL
8
Bits
LSB
LSB
mA
±0.8
±0.8
5
±1
±1
DNL
Zero Code Error
Full Scale Voltage
Least Significant Bit
7
IOS @ RSEN = 3.3 Ω
VFSR Voltage on the SEN Pin
360
380
0.44
400
0.46
mV
LSB
ts
0.42
mA
@ RSEN = 3.3 Ω
VDD = 2.8V, CL=1 μF ,
Output Current Settling
Time
μs
120
0.1
200
@ RSEN = 3.3 Ω,
VCM( 28.5 Ω, 460μH )
Saturation Voltage
VSAT IOUT = 120 mA
-
0.15
V
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點晶科技股份有限公司
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Block Diagram
(DFN10)
PD
VDD
2
1
Voltage Reference
SCL
SDA
8
Output
Driver
I2C Interface
DAC
10
SINK
7
4
9
VSS
SEN
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點晶科技股份有限公司
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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.
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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.
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Table
MSB
LSB
Serial Data Bits 7
Input Register R15 R14 R13 R12 R11 R10 R09 R08 R07 R06 R05 R04 R03 R02 R01 R00
Function
SPD X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
X
X
X
X
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
L
SPD
IC status
Power down
IC Active
-
H
L
H
Soft power down
z
z
X denotes “Don’t care/Unused”.
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.
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Performance Characteristic
1. Typical DNL Plot
Typical DNL Plot @VDD=2.8V, 25degree
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
50
100
150
200
250
DIGITAL Code
2.
Typical INL Plot
Typical INL Plot @VDD=2.8V, 25degree
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
50
100
150
200
250
DIGITAL Code
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3.
Output Sink Current Plot
Isink vs. DAC code @ different temperatures
110
100
90
80
70
60
50
40
30
20
10
-40 degree
25 degree
80 degree
50
100
150
200
250
DIGITAL Code
4.
Maximum Settling Time ( Which is current of SINK, ISINK, from 0 to maximum constant current)
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5.
Saturation voltage (ISINK@120mA)
11-MD118A
VDD = 2.8V
Vsat (mV)
Iout (mA)
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Application Circuit
Compensation Capacitor
CL= 1 F
VCM
VDD
10 F
IL
Rp
Rp
10
1
11-MD118A
VDD
SINK
SDA
SCL
7
8
Output
Driver
I2C Interface
8-BIT DAC
PD
VSS
SEN
I2C MASTER
DEVICE
I2C SLAVE
DEVICE
2
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
IL = IOS + code*LSB = 5mA+127*414uA ≅ 57.6mA
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Application Notes
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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
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.
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.
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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
1200
1000
800
600
400
200
0
0
10
20
30
40
50
60
70
80
90
Ambient Temp. TA(oC)
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Package Specification
(DFN-10)
DIMENSION
(mm)
DIMENSION
(mil)
SYMBOL
MIN.
0.70
0.00
NOM.
0.75
0.02
0.203 REF
0.25
MAX.
0.80
0.05
MIN.
28
0
NOM.
30
0.8
8 REF
10
118
87
118
87
22
MAX.
32
A
A1
A3
b
D
D1
E
2
0.18
2.90
2.10
2.90
1.10
0.45
0.30
3.10
2.30
3.10
1.30
0.65
7
114
83
114
86
18
12
122
91
122
91
3.00
2.20
3.00
1.20
E1
L
0.55
26
e
e1
0.50 BASIC
2.00 BASIC
20 BASIC
79 BASIC
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Package Specifications (WLCSP1)
(size: 0.84*1.84*0.5 mm)
Top View
E
B1
B2
A1
b
A2
A3
B3
B4
A4
L2
e2
DIMENSION
(mm)
SYMBOL
MIN.
0.445
0.17
0.275
0.24
NOM.
0.50
0.2
0.300
0.26
1.84
0.839
0.4
MAX.
0.555
0.23
0.325
0.28
A
A1
S
b
D
1.79
0.789
1.89
0.889
E
e1
e2
L1
L2
0.4
0.320
0.220
0.295
0.195
0.345
0.245
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Package Specifications (WLCSP2)
(size: 1.0*2.0*0.45 mm)
Top View
E
WL8
WL7
WL1
b
WL2
WL3
WL6
WL5
WL4
L2
e2
DIMENSION
(mm)
SYMBOL
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
MAX.
A
A1
A2
b
D
E
e1
e2
L1
L2
0.50
0.12
0.38
0.30
2.05
1.05
0.52
0.52
0.28
0.28
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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.
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