EVAL-ADM1191EBZ【PDF 13/16 页】BOARD EVALUATION FOR ADM1191

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Sheet目录1214

9页 10页 11页 12页 [13页]14页 15页 16页

S ADDRESS R A DATA 1 A DATA 2 A DATA 3 N P

Data Sheet

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 readback. See the Write Command

Byte section for more details.

Voltage and Current Readback

The ADM1191 digitizes both voltage and current. Three bytes

are read back in the format shown in Table 12.

Table 12. Voltage and Current Readback

ADM1191

9. The master asserts a no acknowledge on SDA.

10. The master asserts a stop condition on SDA, and the

transaction ends.

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.

1 2 3 4 5 6 7 8 9 10

SLAVE

Figure 22. Three-Byte Read from ADM1191

Byte

Contents

B7

B6

B5

B4

B3

B2

B1

B0

1

2

Voltage

MSBs

Current

V11

I11

V10

I10

V9

I9

V8

I8

V7

I7

V6

I6

V5

I5

V4

I4

1

S

2

SLAVE

ADDRESS

3

R A

4

DATA 1

5

A

6

DATA 2

7 8

N P

MSBs

Figure 23. Two-Byte Read from ADM1191

3

LSBs

V3

V2

V1

V0

I3

I2

I1

I0

Converting ADC Codes to Voltage and Current Readings

Voltage Readback

The ADM1191 digitizes voltage only. Two bytes are read back in

the format shown in Table 13.

Equation 1 and Equation 2 can be used to convert ADC codes

representing voltage and current from the ADM1191 12-bit ADC

into actual voltage and current values.

Voltage = ( V FULLSCALE /4096) × Code (1)

Table 13. Voltage Only Readback Format

Byte Contents B7 B6 B5 B4

1 Voltage V11 V10 V9 V8

MSBs

2 Voltage V3 V2 V1 V0

LSBs

B3

V7

0

B2

V6

0

B1

V5

0

B0

V4

0

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

(Bit V11 to Bit V0).

Current = (( I FULLSCALE /4096) × Code )/ Sense Resistor

(2)

where:

Current Readback

The ADM1191 digitizes current only. Two bytes are read back

in the format shown in Table 14.

I FULLSCALE = 105.84 mV.

Code is the ADC current code read from the device

(Bit I11 to Bit I0).

Table 14. Current Only Readback Format

Byte Contents B7 B6 B5 B4

1 Current I11 I10 I9 I8

MSBs

B3

I7

B2

I6

B1

I5

B0

I4

Read Status Register

A single register of status data can also be read from the

ADM1191 as follows:

1. The master device asserts a start condition on SDA.

2

Current

LSBs

I3

I2

I1

I0

0

0

0

0

2.

The master sends the 7-bit slave address, followed by the

read bit (high).

3.

The addressed slave device asserts an acknowledge on SDA.

The following series of events occurs when the master receives

three bytes (voltage and current data) from the slave device:

4.

5.

The master receives the status byte.

The master asserts an acknowledge on SDA.

1.

The master device asserts a start condition on SDA.

1

2

3

4

5

S ADDRESS R A

2.

The master sends the 7-bit slave address, followed by the

read bit (high).

SLAVE

STATUS

BYTE

A

3.

4.

5.

6.

7.

8.

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.

Figure 24. Status Read from ADM1191

Table 15 shows the ADM1191 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.

Rev. C | Page 13 of 16

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