AMC7812B Datasheet, PDF (52/92 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
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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, as shown in
Figure 101. Steps for this process are:
1. The master device asserts a start condition.
2. The master then sends the 7-bit AMC7812B slave address followed by a '0' for the direction bit, indicating a
write operation.
3. The AMC7812B asserts an acknowledge signal on SDA.
4. The master sends the first register address.
5. The AMC7812B asserts an acknowledge signal on SDA.
6. The master sends the high byte of the data word to the first register.
7. The AMC7812B asserts an acknowledge signal on SDA.
8. The master sends the low byte of the data word to the first register.
9. The AMC7812B asserts an acknowledge signal on SDA.
10. The master sends a second register address.
11. The AMC7812B asserts an acknowledge signal on SDA.
12. The master then sends the high byte of the data word to the second register.
13. The AMC7812B asserts an acknowledge on SDA.
14. The master sends the low byte of the data word to the second register.
15. The AMC7812B asserts an acknowledge signal on SDA.
16. The master and the AMC7812B repeat steps 4 to 15 until the last data are transferred.
17. The master then asserts a stop condition to end the transaction.
S
Device
Slave Address
Register Pointer
High Byte of Data to
Low Byte of Data to
0 A _{(1st Register Address)} A
1st Register
A
1st Register
A
Register Pointer
High Byte of Data to
Low Byte of Data to
(2nd Register Address) ^A
2nd Register
A
2nd Register
A
Register Pointer
(Last Register Address) ^A
High Byte of Data to
Last Register
A
Low Byte of Data to
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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