MAX17823BGCV datasheet(46/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Maxim Integrated | 46

Battery Management UART Protocol

The Battery-Management UART Protocol uses the following features to maximize the integrity of the

communications:

•

All transmitted data bytes are Manchester-encoded where each data bit is transmitted twice with the

second bit inverted (G.E. Thomas convention).

•

Every transmitted character contains 12 bits which include a start bit, a parity bit, and two stop bits.

•

Read/write packets contain a CRC-8 Packet Error Checking (PEC) byte

•

Each packet is framed by a preamble character and stop character.

•

Read packets contains a data-check byte for verifying the integrity of the transmission.

The protocol is also designed to minimize power-consumption by allowing slave devices to shut down if the UART

is idle for a specified period of time. The host must periodically transmit data to prevent shutdown unless the SHDNL

input is driven externally.

Command Packet

A command packet is defined as a sequence of UART characters originating at the host. Each packet starts with a

preamble character, followed by data characters, and ending with a stop character as shown in Figure 27. After

sending a packet, the host either goes into idle mode or sends another packet.

Figure 27. Command Packet

Preamble Character

The preamble is a framing character that signals the beginning of a command packet. It is transmitted as an un-

encoded 15h with a logic one parity bit and a balanced duty-cycle. If any bit(s) other than the stop bits deviate from

the unique preamble sequence, then the character is not interpreted as a valid preamble, but rather as a data

character.

E=1

Optional

Idle

Optional

Idle

Disable

Idle

Enable

Figure 28. Preamble Character

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