MAX17823B datasheet(53/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Maxim Integrated | 53

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 28. 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 proceeds. A Manchester error immediately switches the data

propagation from read mode to write (pass-through) mode insuring that the Manchester error is propagated through

the daisy-chain and back to the host.

Table 28. READALL Command Sequencing (z = no. of devices)

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

*If alive-counter mode is enabled.

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 it knows where in the data stream it belongs.

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