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PDF EUM6820HIR1 Data sheet ( Hoja de datos )
| Número de pieza | EUM6820HIR1 | |
| Descripción | 100mA Current Sink VCM Driver | |
| Fabricantes | Eutech Microelectronics | |
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EUM6820
100mA Current Sink VCM Driver
with I2C Interface
DESCRIPTION
The EUM6820 is a single 10-bit DAC with 100mA
output current sink capability. It features an internal
reference, I2C interface, 10 bits DAC and current sense
resistor. The DAC is controlled via a 2-wire (I2C
compatible) serial interface that operates at clock rates
up to 400kHz. The EUM6820 can operates from 2.3V
to 5.5V.
The EUM6820 incorporates a power-on reset circuit,
which ensures that DAC output powers up to 0V and
remains there until a valid write takes place. It has a
power-down feature that reduces the current
consumption of the device to 1µA maximum.
The EUM6820 principally designed for linear control
of voice coil motors, targeting at autofocus, image
stabilization, and optical zoom applications in camera
phones , digital still cameras, and camcorders. While it
may also used in many industrial applications, such as
controlling temperature, light, and movement.
The I2C address for the EUM6820 is 0× 18.
FEATURES
z 100mA current sink
z 2-wire (I2C-compatible) 1.8V serial interface
z 10-bit resolution DAC
z 2.3V to 5.5V power supply
z Guaranteed monotonic over all codes
z Power-down to 0.5µA typical
z Internal reference
z Current sense resistor integrated
z Power-down function
z Power-on reset
z Available in 1.0mm× 1.5mm WCSP-6 package
z RoHS compliant and 100% lead (Pb)-free
APPLICATIONS
z Camera phones
z Digital still cameras
z Web/PC cameras
z Digital video cameras/camcorders
z Lens autofocus
z Lens covers
z Optical zoom
z Image stabilization
z Shutters
z Neutral density filters
Application Circuit
DS6820 Ver1.0 Oct. 2009
Figure 1. Application Circuit
1
1 page  
EUM6820Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Electrical Characteristics (continued)
VDD from 2.3V to 5.5V, load resistance RL=25Ω connected to VDD
Full operating temperature range (Ta from -40 to +85 ) unless otherwise noted.
Parameter
Symbol
Conditions
EUM6820
Min. Typ. Max.
Unit
AC Characteristics
Output Current
Settling Time
VDD=3.6V,RL=25Ω,LL=680µH,
30mA to 75mA change
250
µS
Slew Rate
1.8 mA/µS
Major Code Change
Glitch Impulse
1 LSB change around major carry
0.15
nA-S
Digital Feedthrough
0.06 nA-S
Note: (1) Linearity is tested using a reduced code range: code 32 to code 1023.
(2) Guaranteed by design and characterization; not production tested. EN is active low.
SDA and SCL pull-up resistors are tied to 1.8V.
DS6820 Ver1.0 Oct. 2009
5
5 Page 
EUM6820Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Figure 16. Write Operation
Figure 17. Read Operation
Bits
Input
Register
FUNC
Table 1: Data Format
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
PD FL R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 S3 S2 S1 S0
Data is written to the EUM6820 high byte first, MSB first, and is shifted into the 16-bit input register. Until all data is
shifted in, data from the input register is transferred to the DAC register.
Bit 15, the PD bit is a software power down enable. EUM6820 output is disabled and the chip goes into shut-down
mode, when PD is set to high.
Bit 14 is unused;
Bit 13 to Bit 4 correspond to the 10 bits DAC data, B9 to B0.
Power Supply Bypassing And Grounding
Decouple the power supply of EUM6820. A tantalum bead type capacitor of 10µF between VDD and GND to decouple
the power supply is recommended. A 0.1µF(or more) ceramic capacitor is needed to provide a low impedance path to
ground for high transient currents. This ceramic capacitor should be put as close as possible to the VDD pin and should
has a low effective series resistance and effective series inductance.
The power supply line should be large enough to provide a low impedance path and reduce glitch effects on the supply
line.
DS6820 Ver1.0 Oct. 2009
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EUM6820HIR1.PDF ] | |
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