AMC7812B_14 Datasheet, PDF (53/93 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
www.ti.com
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
Reading a Single Word from Any Register (Figure 102)
Figure 102 shows a diagram of this protocol. Steps for this protocol 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 a register address.
5. The AMC7812B asserts an acknowledge signal on SDA.
6. The master device asserts a restart condition.
7. The master then sends the 7-bit AMC7812B slave address followed by a '1' for the direction bit, indicating a
read operation.
8. The AMC7812B asserts an acknowledge signal on SDA.
9. The AMC7812B then sends the high byte of the register (D[15:8]).
10. The master asserts an acknowledge signal on SDA.
11. The AMC7812B sends the low byte of the register (D[7:0]).
12. The master asserts a not acknowledge signal on SDA.
13. The master then asserts a stop condition to end the transaction.
S
Device
Slave Address
0A
Register Pointer
(Register Address)
A Sr
Device
Slave Address
1
From High Byte of
From Low Byte of
A
Device Register
A
Device Register
NP
From Master to Slave
From Slave to Master
A = Acknowledge
N = Not Acknowledge
S = START Condition
P = Stop Condition
Sr = Repeated START Condition
Figure 102. Read a Single Word
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