MAX17843 datasheet(56/131 Pages) MAXIM

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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 unen-

coded 54h with a logic-one parity bit and a balanced duty

cycle (see Figure 34).

UART Idle Mode

In the low-Z (default) idle mode, the transmitter outputs are

both driven to 0V (see Figure 35). 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, send-

ing 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 TXnP pin must be pulled high (logic-one) prior

to signaling the start bit (logic-zero) (see Figure 35). The

duration of the logic-one is minimized to maintain a bal-

anced duty-cycle while still meeting the timing specifica-

tion. When transitioning from the stop bit back to idle

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

Figure 34. Stop Character

Figure 35. Communication Mode

0 E = 1 P

OPTIONAL

IDLE

OPTIONAL

IDLE

DISABLE

IDLE

ENABLE

TXnP

TXnN

IDLE

PREAMBLE

tSTSU

TXnP-TXnN

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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