AMC7812 Datasheet, PDF (52/92 Pages) Texas Instruments – 12-Bit ANALOG MONITORING AND CONTROL SOLUTION with Multichannel ADC, DACs, and Temperature Sensors

AMC7812
SBAS513D – JANUARY 2011 – REVISED OCTOBER 2012
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Writing Multiple Words to Different Registers (Figure 101)
A complete word must be written to a register (high byte and low byte) for proper operation.
1. The master device asserts a start condition.
2. The master then sends the 7-bit AMC7812 slave address followed by a zero for the direction bit, indicating a
write operation.
3. The AMC7812 asserts an acknowledge signal on SDA.
4. The master sends the first register address.
5. The AMC7812 asserts an acknowledge signal on SDA.
6. The master sends the high byte of the data word to the first register.
7. The AMC7812 asserts an acknowledge signal on SDA.
8. The master sends the low byte of the data word to the first register.
9. The AMC7812 asserts an acknowledge signal on SDA.
10. The master sends a second register address.
11. The AMC7812 asserts an acknowledge signal on SDA.
12. The master then sends the high byte of the data word to the second register.
13. The AMC7812 asserts an acknowledge on SDA.
14. The master sends the low byte of the data word to the second register.
15. The AMC7812 asserts an acknowledge signal on SDA.
16. The master and the AMC7812 repeat steps 4 to 15 until the last data are transferred.
17. The master then asserts a stop condition to end the transaction.
S
AMC7812
Slave Address
0
A
Register Pointer
(1st Register Address)
A
High Byte of Data to
1st Register
A
Low Byte of Data to
1st Register
A
Register Pointer
(2nd Register Address) ^A
High Byte of Data to
2nd Register
A
Low Byte of Data to
2nd Register
A
Register Pointer
High Byte of Data to
Low Byte of Data to
(Last Register Address) ^A
Last Register
A
Last Register
AP
From Master to Slave
From Slave to Master
A = Acknowledge
N = Not Acknowledge
S = START Condition
P = Stop Condition
Sr = Repeated START Condition
Figure 101. Write to Multiple 16-Bit Registers
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