ISL76534 Datasheet, PDF (17/24 Pages) Intersil Corporation – 14-channel gamma references

ISL76534
Read Operation
Table 4 describes a Read operation and Figure 28 shows the
read timing diagram.
I²C DATA
FROM MASTER
START
I²C DATA
FROM ISL76534
TABLE 4. READ TRANSACTION
I²C START Signal
NOTES
0xE8 or 0xEA
ACK
Send Device Address + R/W Bit (depends on the state of A0 pin)
1110100 + 0, if A0 = LOW
1110101 + 0, if A0 = HIGH
Register Pointer
ACK
Register Pointer indicating starting register location to write to.
Register Pointer = 0x00 for Control Byte
Register Pointer = 0x01 for DAC 1 MSB/LSB data
Register Pointer = 0x02 for DAC 2 MSB/LSB data
...
Register Pointer = 0x0E for DAC 14 MSB/LSB data
Register Pointer = 0x0F for DAC 15 MSB/LSB data
STOP
START
0xE9
0xE9 or 0xEB
ACK
ACK
ACK
ACK
ACK
ACK
...
NAK
STOP
ACK
ACK
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
...
DAC 15 LSB
For more information on the Register Pointer see Table 2 on page 14.
I²C STOP signal
I²C START signal
Send Device Address + R/W Bit
1110100 + 1
Send Device Address + R/W Bit (depends on the state of A0 pin)
1110100 + 1, if A0 = LOW
1110101 + 1, if A0 = HIGH
If Register Pointer = 0x00, Byte 1 is a Null Byte
If Register Pointer = 0x01 or more, Byte 1 is the MSB byte of the DAC word
...
If Register Pointer = 0x00, Byte 2 is a Null Byte
If Register Pointer = 0x01 or more, Byte 2 is the LSB byte of the DAC word
...
MSB of DAC (1 + Register Pointer). Ex) Register Pointer = 0x00, MSB of DAC1
LSB of DAC (1 + Register Pointer). Ex) Register Pointer = 0x00, LSB of DAC1
MSB of DAC (2 + Register Pointer)
LSB of DAC (2 + Register Pointer)
The READ operation can be stopped at any time after a register has been read
8 LSBs of DAC 15’s 10-bit value: dddd dddd
I²C STOP Signal
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FN8866.0
July 27, 2016