SITI 11-MD118B

11-MD118B
Version
Issue Date
File Name
Total Page
: A.004
: 2007-08-07
: SP-MD118B-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-MD118B
8-Bit DAC VCM Driver with I2C Interface
General Specifications
The 11-MD118B 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-MD118B 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)
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Pin Assignment
Pin Assignment of DFN10 (3*3*0.8 mm)
Top View
VDD
1
10
SINK
PD
2
9
SEN
NC
3
8
SCL
VSS
4
7
SDA
NC
5
6
NC
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(High power down, Low operation)
Ground Pin
The I2C slave 7-bit address of 11-MD118B 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.
Pin Name
Description
A1
SEN
Analog Output : Programmable FSR Current Sinking
A2
PD
Digital Input: Power Down Mode(Logic ‘H’: 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
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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 ‘H’: 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
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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 = H (Power down mode)
-
-
±0.5
uA
( IDD )
IDD
PD = L (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-MD118B-A.004.doc
VSAT
Ω, 460μ H )
IOUT = 120 mA
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Block Diagram
(DFN10)
PD
VDD
2
1
Voltage Reference
SCL
8
I2C Interface
SDA
DAC
Output
Driver
10
7
4
9
VSS
SEN
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SINK
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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-MD118B.
Sink Current
Sink Current is the input current driven by the power MOS embedded in the 11-MD118B.
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Data Format
11-MD118B Write Mode
When in the write mode, data is written to the 11-MD118B 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-MD118B Read Mode
When 11-MD118B 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
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 denotes IC active, and H just reset the
DAC registers (D9~D0 -> 0) without shutdown any analog cell for reducing recovery
time consideration. Regarding to all kinds of IC operation situations please refers to
following table.
PD
SPD
IC status
H
-
Power down
L
L
IC Active
H
Soft power down
z
X denotes “Don’t care/Unused”.
z
D9, D0 denote MSB and LSB of DAC, respectively.
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.
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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
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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)
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5.
Saturation voltage (ISINK@120mA)
11-MD118B
VDD = 2.8V
Vsat (mV)
Iout (mA)
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Application Circuit
Compensation Capacitor
CL= 1 F
VCM
VDD
10 F
Rp
0.1 F
IL
Rp
1
11-MD118B
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 = H (power down mode)
PD = L (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
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Application Notes
z
The 11-MD118B is a constant current control IC for application in Auto-Focus.
The supply voltage range VDD of 11-MD118B 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 power down pin of 11-MD118B. Logic low level (PD = L) is for
IC operation. On the other hand, its logic high level (PD = H) puts the chip into
power down mode for power saving. It is recommended to keep PD at high level
(PD = H) 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-MD118B 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
Power Dissipation (mW)
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)
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-MD118B-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
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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-MD118B-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
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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-MD118B-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
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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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