ADM1192 Analog Devices, ADM1192 Datasheet - Page 14

• Manufacturer Part Number: ADM1192
• Description: Digital Power Monitor with Clear Pin and ALERT Output
• Manufacturer: Analog Devices

Specifications of ADM1192

• Max Pos Supply (v): +26V
• Current Monitoring: 2
• Glitch Filter: Programmable Timer
• Clrb Pin: X
• Alert/alertb: ALERT
• Number Of I2c Addresses: 4
• Package: MSOP

ADM1192
READ VOLTAGE AND/OR CURRENT DATA BYTES
Depending on how the device is configured, ADM1191 can be
set up to provide information in three ways after a conversion
(or conversions): voltage and current readback, voltage only
readback, and current only read back. See the Write Command
Byte section for more details.
Voltage and Current Readback
The ADM1192 digitizes both voltage and current. Three bytes
are read back in the format shown in Table 12.
Table 12. Voltage and Current Readback Format
Byte
1
2
3
Voltage Readback
The ADM1192 digitizes voltage only. Two bytes are read back in
the format shown in Table 13.
Table 13. Voltage Only Readback Format
Byte Contents
1
2
Current Readback
The ADM1192 digitizes current only. Two bytes are read back
in the format shown in Table 14.
Table 14. Current Only Readback Format
Byte Contents
1
2
The following series of events occurs when the master receives
three bytes (voltage and current data) from the slave device:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. The master asserts a stop condition on SDA, and the
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.
transaction ends.
Voltage MSBs
Voltage LSBs
Current MSBs
Current LSBs
Contents
Voltage
MSBs
Current
MSBs
LSBs
B7
V11
I11
V3
B7
V11 V10 V9 V8 V7 V6
V3
B7
I11
I3
B6
V10
I10
V2
B6
V2
B6
I10
I2
B5
V9
I9
V1
B5 B4 B3 B2
V1 V0
B5 B4 B3 B2
I9
I1
I8
I0
B4
V8
I8
V0
I7
0
0
B3
V7
I7
I3
I6
0
0
B2
V6
I6
I2
B1
V5
B1
I5
0
0
B1
V5
I5
I1
B0
V4
B0
I4
0
0
Rev. B | Page 14 of 20
B0
V4
I4
I0
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.
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.
where:
V
Code is the ADC voltage code read from the device
(Bit V11 to Bit V0).
where:
I
Code is the ADC current code read from the device
(Bit I11 to Bit I0).
Read Status Register
A single register of status data can also be read from the
ADM1192 as follows:
1.
2.
3.
4.
5.
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.
FULLSCALE
FULLSCALE
Voltage = (V
Current = ((I
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 status byte.
The master asserts an acknowledge on SDA.
1
S
= 105.84 mV.
= 6.65 V (7:2 range) or 26.52 V (14:1 range).
1
S
ADDRESS R A DATA 1
SLAVE
ADDRESS
Figure 24. Three-Byte Read from ADM1192
SLAVE
2
Figure 25. Two-Byte Read from ADM1192
Figure 26. Status Read from ADM1192
2
FULLSCALE
FULLSCALE
1
S
ADDRESS
SLAVE
R A
3
2
3
/4096) × Code
/4096) × Code)/Sense Resistor
4
DATA 1
R A
4
A
5
3
DATA 2
STATUS
BYTE
6
A
5
4
DATA 2
7
A
6
A
5
DATA 3
8
N P
7 8
9 10
N P
(1)
(2)