MAX17843 datasheet(60/131 Pages) MAXIM

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WRITEALL Command

The WRITEALL command writes a 16-bit value to a speci-

fied register in all daisy-chained devices. Since most con-

figuration information is common to all the devices, this

command allows faster setup than writing to each device

individually. If the register address is not valid for the

device, the command is ignored. The command sequence

is shown in Table 28.

The register value is written immediately after the valid

PEC byte is received, or if NOPEC is set, after the last

byte is received. If the received PEC byte does not match

the internal calculation, the command is not executed, but

is still forwarded to the next device. The PEC is calculated

from the first four bytes of the command starting after the

preamble. A PEC error will generate a PEC alert in the

device STATUS register.

WRITEDEVICE Command

The WRITEDEVICE command writes a 16-bit value to

the specified register in the addressed device only. If the

is ignored. The command sequence is shown in Table 29.

The register value is written immediately after the valid

PEC byte is received, or if NOPEC is set, after the last

byte is received. If the received PEC byte does not match

the internal calculation, the command is not executed,

but is still forwarded to the next device. The PEC is cal-

culated from the first four bytes of the command starting

after the preamble. A PEC error sets the ALRTPEC bit in

the STATUS register. A PEC error can only occur in the

addressed device.

Table 28. WRITEALL Sequencing (Unchanged by Daisy-Chain)

Table 29. WRITEDEVICE Sequencing (Unchanged by Daisy-Chain)

*If alive-counter mode is enabled.

HOST TX

DEVICE (n) RXL

DEVICE (n) TXU

HOST RX

Preamble

02h

[REG ADDR]

[DATA LSB]

[DATA MSB]

[PEC]

[ALIVE]*

Stop

HOST TX

DEVICE (N) RXL

DEVICE (N) TXU

HOST RX

Preamble

{(DA[4:0]),0b100}

[REG ADDR]

[DATA LSB]

[DATA MSB]

[PEC]

[ALIVE]*

Stop

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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