As shown in Figure 7-15, an individual device read command is indicated by C[0] = 1. As shown in Figure 7-16,

the TMP144 in the daisy-chain that corresponds to the device ID pointed by bits C[6:3] then breaks the bus,

transmits the data from the register pointed by bits C[2:1], and reconnects the bus.

GLBL

IN3/ID3

IN2/ID2

IN1/ID1

IN0/ID0

P1

P0

R/W

ID0

ID1

ID2

ID3

0

1

P0

P1

S

P

0

1

0

1

0

1

0

1

S

P

Calibration Byte (55h)

Command Byte

D11

D12

D13

D14

D15

D8

D9

D10

S

P

D3

D4

D5

D6

D7

D0

D1

D2

S

P

Device-1 Data Byte-1

Device-1 Data Byte-2

Host TX

Host RX

Host TX

Host RX

ID0

ID1

ID2

ID3

0

1

P0

P1

S

P

0

1

0

1

0

1

0

1

S

P

Devices

in Pass

Through

Figure 7-15. Individual Read Command Flow

Host

Device

(1)

Device

(2)

Device

(N)

RX

TX

Interface Logic

Interface Logic

Interface Logic

RX

RX

RX

TX

TX

TX

Figure 7-16. TMP144 Daisy-Chain: Bus Status During Individual Read Operation of Second Device

TMP144

SBOS891A – OCTOBER 2018 – REVISED FEBRUARY 2021

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