MAX17843 datasheet(61/131 Pages) MAXIM

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READALL Command

The READALL command returns register data from the

specified register for all daisy-chain devices. The data

for the first device (connected to host) is returned last.

The command sequence is shown in Table 30. If the

received PEC byte does not match the calculated value,

the ALRTPEC bit of the data-check byte and ALRTPEC

bit of the STATUS register are set, but the command pro-

ceeds. 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.

The fill-byte values transmitted by the MAX17841B

interface alternate between C2h and D3h as shown.

As the packet propagates through the device, the device

retransmits it in the order shown in the sequencing table

(device TXU column). The device knows which bytes to

overwrite since its ADDRESS register contains the first

device address and its own device address and therefore

knows where in the data stream it belongs.

Table 30. READALL Command Sequencing (z = Number of Devices)

*If alive-counter mode is enabled.

HOST TX

DEVICE (n) RXL

DEVICE (n) TXU

HOST RX

Preamble

03h

[REG ADDR]

[DATA ADDR]

[REG ADDR]

[DC] = 0x00

[DATA LSB(n-1)]

[DATA LSB(n)]

[DATA LSB(z)]

[PEC]

[DATA MSB(n-1)]

[DATA MSB(n)]

[DATA MSB(z)]

[ALIVE]*

…

[DATA LSB(z-1)]

[FD(1) C2h]

…

[DATA MSB(z-1)]

[FD(1) D3h]

[DATA LSB(1)]

…

[FD(2) C2h]

[DATA MSB(1)]

…

[FD(2) D3h]

[DC]

…

[PEC]

…

[ALIVE]*

…

[FD(1) C2h]

…

[FD(1) D3h]

[DATA LSB(1)]

…

[DATA MSB(1)]

…

[DC]

[FD(z) C2h]

[FD(z-n) C2h]

[FD(z-n-1) C2h]

[PEC]

[FD(z) D3h]

[FD(z-n) D3h]

[FD(z-n-1) D3h]

[ALIVE]*

Stop

12+(4 x z) characters

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

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