MAX17843 datasheet(63/131 Pages) MAXIM

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READBLOCK Command

The READBLOCK command returns an 18-byte read

from the specified register for a block size of 1 in the

addressed device only. If the register address is not valid

for the device, it returns zero for any invalid addresses. If

the device address is not valid, the command is ignored.

The command sequences for a block size of 1 and for

a block size of 2 are shown in Table 32 and Table 33,

respectively.

The command packet is forwarded up the daisy-chain

until it reaches the addressed device. The addressed

device overwrites the received fill bytes with the two bytes

of register data (from a single device) and forwards the

packet to the next device. The alive-counter byte is only

incremented by the addressed device. A Manchester error

immediately switches the data propagation from read

mode to write (pass-through) mode, ensuring that the

Manchester error is propagated through the daisy-chain

and back to the host.

Table 32. READBLOCK Sequencing for Block Size = 1

Table 33. READBLOCK Sequencing for Block Size = 2

*If alive-counter mode is enabled.

HOST TX

DEVICE RXL

DEVICE TXU

HOST RX

Preamble

{BS[4:0], 3b110}

[DEVICE ADDR]

[REG ADDR]

[DC]

[DATA LSB]

[PEC]

[DATA MSB]

[ALIVE]*

[DC]

[FD(1) C2h]

[PEC]

[FD(1) D3h]

[ALIVE]*

Stop

18 characters

HOST TX

DEVICE RXL

DEVICE TXU

HOST RX

Preamble

{BS[4:0], 3b110}

[DEVICE ADDR]

[REG ADDR]

[DC]

[DATA0 LSB]

[PEC]

[DATA0 MSB]

[ALIVE]*

[DATA1 LSB]

[FD(1) C2h]

[DATA1 MSB]

[FD(1) D3h]

[DC]

[FD(1) C2h]

[PEC]

[FD(1) D3h]

[ALIVE]*

Stop

22 characters

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

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