MAX17823BGCV datasheet(48/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Stop Character

The stop character is a framing character that signals the end of a command packet. It is transmitted as an

un-encoded 54h with a logic one parity bit and a balanced duty-cycle.

E=1

Optional

Idle

Optional

Idle

Disable

Idle

Enable

Figure 30. Stop Character

UART Idle Mode

In the low-Z (default) idle mode, the transmitter outputs are both driven to 0V as shown in Figure 31. In the high-Z

idle mode, the transmitter outputs are not driven by the UART. The MAX17841B interface automatically places its

transmitter in idle mode immediately after each command packet and remains in idle mode until either the next

command packet is sent or it goes into keep-alive mode sending periodic stop characters to prevent the daisy-chain

device(s) from going into shutdown.

UART Communication Mode

When transitioning from idle mode to communication mode, the TXP pin must be pulled high (logic one) prior to

signaling the start bit (logic zero) as shown in Figure 31. The duration of the logic one is minimized to maintain a

balanced duty-cycle while still meeting the timing specification. When transitioning from the stop bit back to idle

mode, the delay, if any, is also minimized.

TXnP

TXnN

Idle

Preamble

tSTSU

TXnP-TXnN

Figure 31. Communication Mode

Data Types

The Battery-Management UART Protocol employs several different data types as described in Table 21.

Table 21. Data Types

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