AD5372/AD5373

Rev. C | Page 23 of 28

SPECIAL FUNCTION MODE

If the mode bits are 00, then the special function mode is selected, as shown in Table 15. Bit I21 to Bit I16 of the serial data-word select the

special function, and the remaining bits are data required for execution of the special function, for example, the channel address for data

readback. The codes for the special functions are shown in Table 16. Table 17 shows the addresses for data readback.

Table 15. Special Function Mode

I23

I22

I21

I20

I19

I18

I17

I16

I15

I14

I13

I12

I11

I10

I9

I8

I7

I6

I5

I4

I3

I2

I1

I0

0

0

S5

S4

S3

S2

S1

S0

F15

F14

F13

F12

F11

F10

F9

F8

F7

F6

F5

F4

F3

F2

F1

F0

Table 16. Special Function Codes

Special Function Code

S5

S4

S3

S2

S1

S0

Data (F15 to F0)

Action

0

0

0

0

0

0

0000 0000 0000 0000

NOP.

0

0

0

0

0

1

XXXX XXXX XXXX X[F2:F0]

Write control register.

F4 = overtemperature indicator (read-only bit). This bit should be 0 when

writing to the control register.

F3 = reserved. This bit should be 0 when writing to the control register.

F2 = 1: Select Register X1B for input.

F2 = 0: Select Register X1A for input.

F1 = 1: Enable thermal shutdown mode.

F1 = 0: Disable thermal shutdown mode.

F0 = 1: Software power-down.

F0 = 0: Software power-up.

0

0

0

0

1

0

XX[F13:F0]

Write data in F13 to F0 to OFS0 register.

0

0

0

0

1

1

XX[F13:F0]

Write data in F13 to F0 to OFS1 register.

0

0

0

1

0

0

Reserved

0

0

0

1

0

1

See Table 17

Select register for readback.

0

0

0

1

1

0

XXXX XXXX [F7:F0]

Write data in F7 to F0 to A/B Select Register 0.

0

0

0

1

1

1

XXXX XXXX [F7:F0]

Write data in F7 to F0 to A/B Select Register 1.

0

0

1

0

0

0

XXXX XXXX [F7:F0]

Write data in F7 to F0 to A/B Select Register 2.

0

0

1

0

0

1

XXXX XXXX [F7:F0]

Write data in F7 to F0 to A/B Select Register 3.

0

0

1

0

1

0

Reserved

0

0

1

0

1

1

XXXX XXXX [F7:F0]

Block write to A/B select registers.

F7 to F0 = 0: Write all 0s (all channels use the X2A register).

F7 to F0 = 1: Write all 1s (all channels use the X2B register).

Table 17. Address Codes for Data Readback1

F15

F14

F13

F12

F11

F10

F9

F8

F7

Register Read

0

0

0

X1A register

0

0

1

X1B register

0

1

0

C register

0

1

1

Bit F12 to Bit F7 select the channel to be read back,

from Channel 0 = 001000 to Channel 31 = 100111

M register

1

0

0

0

0

0

0

0

1

Control register

1

0

0

0

0

0

0

1

0

OFS0 data register

1

0

0

0

0

0

0

1

1

OFS1 data register

1

0

0

0

0

0

1

0

0

Reserved

1

0

0

0

0

0

1

1

0

A/B Select Register 0

1

0

0

0

0

0

1

1

1

A/B Select Register 1

1

0

0

0

0

1

0

0

0

A/B Select Register 2

1

0

0

0

0

1

0

0

1

A/B Select Register 3

1

0

0

0

0

1

0

1

0

Reserved

1 Bit F6 to Bit F0 are don’t cares for the data readback function.