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ADM1192
READ VOLTAGE AND/OR CURRENT DATA BYTES
Depending on how the device is configured, the ADM1192 can
Data Sheet
For cases where the master is reading voltage only or current
only, two data bytes are read and Step 7 and Step 8 are not required.
be set up to provide information in three ways after a conversion
1
2
3
4
5
6
7
8
9 10
S ADDRESS R A DATA 1 A DATA 2 A DATA 3 N P
(or conversions): voltage and current readback, voltage only
readback, and current only read back. See the Write Command
Byte section for more details.
SLAVE
Figure 24. Three-Byte Read from ADM1192
Voltage and Current Readback
1
2
3
4
5
6
7 8
S ADDRESS R A
The ADM1192 digitizes both voltage and current. Three bytes
SLAVE
DATA 1
A
DATA 2
N P
are read back in the format shown in Table 12.
Figure 25. Two-Byte Read from ADM1192
Table 12. Voltage and Current Readback Format
Byte Contents B7 B6 B5 B4 B3 B2
1 Voltage V11 V10 V9 V8 V7 V6
MSBs
2 Current I11 I10 I9 I8 I7 I6
B1
V5
I5
B0
V4
I4
Converting ADC Codes to Voltage and Current Readings
Equation 1 and Equation 2 can be used to convert ADC codes
representing voltage and current from the ADM1175 12-bit
ADC into actual voltage and current values.
MSBs
3 LSBs V3
Voltage Readback
V2
V1
V0
I3
I2
I1
I0
Voltage = ( V FULLSCALE /4096) × Code
where:
V FULLSCALE = 6.65 V (7:2 range) or 26.52 V (14:1 range).
Code is the ADC voltage code read from the device
(1)
The ADM1192 digitizes voltage only. Two bytes are read back in
the format shown in Table 13.
(Bit V11 to Bit V0).
Current = (( I FULLSCALE /4096) × Code )/ Sense Resistor
(2)
Tabl e 13. Voltage Only Readback Format
Byte Contents B7 B6 B5 B4 B3 B2
1 Voltage MSBs V11 V10 V9 V8 V7 V6
2 Voltage LSBs V3 V2 V1 V0 0 0
B1
V5
0
B0
V4
0
where:
I FULLSCALE = 105.84 mV.
Code is the ADC current code read from the device
(Bit I11 to Bit I0).
Read Status Register
Current Readback
The ADM1192 digitizes current only. Two bytes are read back
in the format shown in Table 14.
A single register of status data can also be read from the
ADM1192 as follows:
1. The master device asserts a start condition on SDA.
Tabl e 14. Current Only Readback Format
Byte Contents B7 B6 B5 B4 B3 B2
1 Current MSBs I11 I10 I9 I8 I7 I6
2 Current LSBs I3 I2 I1 I0 0 0
B1
I5
0
B0
I4
0
2.
3.
4.
5.
The master sends the 7-bit slave address, followed by the
read bit (high).
The addressed slave device asserts an acknowledge on SDA.
The master receives the status byte.
The master asserts an acknowledge on SDA.
S ADDRESS R A
The following series of events occurs when the master receives
three bytes (voltage and current data) from the slave device:
1 2 3
SLAVE
4
STATUS
BYTE
5
A
1.
2.
3.
4.
5.
6.
7.
8.
9.
The master device asserts a start condition on SDA.
The master sends the 7-bit slave address, followed by the
read bit (high).
The addressed slave device asserts an acknowledge on SDA.
The master receives the first data byte.
The master asserts an acknowledge on SDA.
The master receives the second data byte.
The master asserts an acknowledge on SDA.
The master receives the third data byte.
The master asserts a no acknowledge on SDA.
Figure 26. Status Read from ADM1192
Table 15 shows the ADM1192 STATUS registers in detail. Note
that Bit 1, Bit 3, and Bit 5 are cleared by writing to Bit 4 (the
CLEAR bit) of the ALERT_EN register.
10. The master asserts a stop condition on SDA, and the
transaction ends.
Rev. D | Page 14 of 20
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