ltc3207euf-trpbf Linear Technology Corporation, ltc3207euf-trpbf Datasheet - Page 13

• Manufacturer Part Number: ltc3207euf-trpbf
• Description: 600ma Universal Multi-output Led/cam Driver
• Manufacturer: Linear Technology Corporation

OPERATION
REG13, Camera
LED 4-bit high and 4-bit low DAC data.
REG14, ENU
Setting bit high selects the outputs to be controlled by ENU.
REG15, ENU, Gradation and Blink Times
Setting bits 0 high to 3 high selects the outputs to be
controlled by ENU. Bits 4 to 7 control gradation and
blink times.
START and STOP Conditions
A bus-master signals the beginning of a communication
to a slave device by transmitting a START condition.
A START condition is generated by transitioning SDA
from high to low while SCL is high. When the master has
fi nished communicating with the slave, it issues a STOP
condition by transitioning SDA from low to high while
SCL is high. The bus is then free for communication with
another I
2
C device.
Register Sub-Address = 1101
Register Sub-Address = 1110
Register Sub-Address = 1111
Sub-Address = 1111
ULED12
ULED8
MSB
Bit 7
MSB
Bit 7
D3
3
D7
0
0
1
1
ENU Output Selection
ULED11
ULED7
Bit 6
Bit 6
D2
2
Blink Times and Period
HIGH BITS
D6
0
1
0
1
ULED10
ULED6
Bit 5
Bit 5
D1
1
0.625s
0.156s
0.625s
0.156s
Blink
ULED5
ULED9
Bit 4
Bit 4
LSB
LSB
D0
0
Period
1.25s
1.25s
2.5s
2.5s
Byte Format
Each byte sent to the LTC3207/LTC3207-1 must be 8 bits
long followed by an extra clock cycle for the Acknowledge
bit to be returned by the LTC3207/LTC3207-1. The data
should be sent to the device most signifi cant bit (MSB)
fi rst.
ULED4
MSB
Bit 3
Bit 3
D3
D5
0
0
1
1
ULED3
Bit 2
Bit 2
D2
Gradation Ramp Times and Period
LOW BITS
LTC3207/LTC3207-1
D4
0
1
0
1
ULED2
Bit 1
Bit 1
D1
Disabled
Ramp
0.24s
0.48s
0.96s
ULED1
Bit 0
Bit 0
LSB
LSB
D0
Disabled
Period
0.45s
0.9s
1.8s
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