Calibration Byte (55h)

S

P

1

1

A0

A1

A2

A3

A4

S

P

P0

P1

P2

P3

0

0

1

1

0

G/nI R/nW C/nA

Command and Address Phase (A4:A0 = N)

S

P

Data Byte 2 (From Device N)

D8

D9

D10

D11 D12 D13

D14 D15

S

P

Data Byte 1 (From Device N)

D0

D1

D2

D3

D4

D5

D6

D7

Register Pointer Phase

S

P

1

0

1

0

1

1

0

0

7ms

1.5 Bd

7ms

1.5 Bd

S

P

Data Byte 2 (From Device N - 1)

D8

D9

D10

D11 D12 D13

D14 D15

S

P

Data Byte 1 (From Device N - 1)

D0

D1

D2

D3

D4

D5

D6

D7

7ms

S

P

Data Byte 2 (From Device N - 2)

D8

D9

D10

D11 D12 D13

D14 D15

S

P

Data Byte 1 (From Device N - 2)

D0

D1

D2

D3

D4

D5

D6

D7

7ms

S

P

Data Byte 2 (From Device 1)

D8

D9

D10

D11 D12 D13

D14 D15

S

P

Data Byte 1 (From Device 1)

D0

D1

D2

D3

D4

D5

D6

D7

1.5 Bd

1.5 Bd

1

0

1

0

1

0

1

0

Calibration Byte (55h)

S

P

1

0

A0

A1

A2

A3

A4

S

P

P0

P1

P2

P3

0

0

1

1

0

G/nI R/nW C/nA

Command and Address Phase

S

P

Data Byte 2

D8

D9

D10 D11 D12 D13

D14 D15

S

P

Data Byte 1

D0

D1

D2

D3

D4

D5

D6

D7

Register Pointer Phase

P

S

P

Calibration Byte (55h)

S

P

0

1

A0

A1

A2

A3

A4

0

G/nI R/nW C/nA

Command and Address Phase

S

P

Data Byte 2

D8

D9

D10 D11 D12 D13 D14 D15

S

P

Data Byte 1

D0

D1

D2

D3

D4

D5

D6

D7

S

P

7ms

1.5 Bd

1

0

1

0

1

0

1

0

S

P

P0

P1

P2

P3

0

1

0

1

Register Pointer Phase

TMP107

www.ti.com

SBOS716B – MAY 2015 – REVISED SEPTEMBER 2015

7.3.3.2.2.2

Individual Read

Use the individual read operation to read the value of a register in a single device in the daisy chain, as shown in

Figure 27. There is delay of up to 1.5 baud before the device responds back to the host. The host reads the data

from the device by synchronizing to the falling edge of the start bit.

Figure 27. Individual Read Address Operation

7.3.3.2.2.3

Global Write

Use the global write operation to write data to a specific register in multiple parts. The sequence of the

communication is shown in Figure 28. Data in this operation are written to the registers in all the devices from the

first device to the address specified in the address field of the command and address phase.

Figure 28. Global Write Operation

7.3.3.2.2.4

Global Read

Use the global read address operation to read the value of the register pointed to by the Register Pointer Phase

section. The daisy chain returns data starting from the address specified in the command or address phase, and

ending with the address of the first device in the daisy chain. The data phase of the global read address

operation is different from other address operations because the data phase consists of data read back from

every device on the bus between the addressed device and first device, as shown in Figure 29. If the address

specified exceeds the address of the last device, the operation halts and the bus times out after 35 ms. There is

a delay of up to 1.5 baud before the devices respond back to the host. The host reads the data from the devices

by synchronizing to the falling edge of the start bits.

Figure 29. Global Read Operation

Copyright © 2015, Texas Instruments Incorporated

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