EVAL-ADM1177EBZ【PDF 19/24 页】BOARD EVALUATION FOR ADM1177

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Data Sheet

READ VOLTAGE AND/OR CURRENT DATA BYTES

Depending on how the device is configured, the ADM1177

can be set up to provide information in three ways: voltage

ADM1177

For cases where the master is reading voltage only or current

only, only two data bytes are read and Step 7 and Step 8 are not

required.

and current readback, voltage only readback, and current

1

2

3

4

5

6

7

8

9 10

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

only readback. See the Write Command Byte section for

more details.

Voltage and Current Readback

The ADM1177 digitizes both voltage and current. Three bytes

SLAVE

Figure 40. Three-Byte Read from ADM1177

are read back in the format shown in Table 12.

Table 12. Voltage and Current Readback Format

1

S

2

SLAVE

ADDRESS

3

R A

4

DATA 1

5

A

6

DATA 2

7 8

N P

Byte

1

2

3

Contents

Voltage

MSBs

Current

MSBs

LSBs

B7

V11

I11

V3

B6

V10

I10

V2

B5

V9

I9

V1

B4

V8

I8

V0

B3

V7

I7

I3

B2

V6

I6

I2

B1

V5

I5

I1

B0

V4

I4

I0

Figure 41. Two-Byte Read from ADM1177

Converting ADC Codes to Voltage and Current Readings

The following equations can be used to convert ADC codes

representing voltage and current from the ADM1177 12-bit

ADC into actual voltage and current values.

Voltage Readback

The ADM1177 digitizes voltage only. Two bytes are read back in

the format shown in Table 13.

Tabl e 13. Voltage Only Readback Format

Byte Contents B7 B6 B5 B4 B3 B2 B1 B0

1 Voltage MSBs V11 V10 V9 V8 V7 V6 V5 V4

2 Voltage LSBs V3 V2 V1 V0 0 0 0 0

Current Readback

The ADM1177 digitizes current only. Two bytes are read back

in the format shown in Table 14.

Voltage = ( V FULLSCALE /4096) × Code

where:

V FULLSCALE = 6.65 V (7:2 range) or 26.35 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

where:

I FULLSCALE = 105.84 mV.

Code is the ADC current code read from the device

(Bit I11 to Bit I0).

Read Status Register

(10)

(11)

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

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

ADM1177 as follows:

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

2. The master sends the 7-bit slave address followed by the

read bit (high).

The following series of events occurs when the master receives

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

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

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

3.

4.

5.

The addressed slave device asserts an acknowledge on

SDA.

The master receives the status byte.

The master asserts an acknowledge on SDA.

read bit (high).

1

2

3

4

5

S ADDRESS R A

3.

The addressed slave device asserts an acknowledge

on SDA.

SLAVE

STATUS

BYTE

A

4.

5.

6.

7.

8.

9.

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 42. Status Read from ADM1177

Table 15 shows the ADM1177 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. C | Page 19 of 24

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