MAX17843ACB datasheet(55/131 Pages) MAXIM

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Data Characters

Each data character contains a single-nibble (4-bit) pay-

load, so two characters must be transmitted for each byte

of data. All data is transmitted least-significant bit, least-

significant nibble, and least-significant byte first. The data

itself is Manchester encoded, which means that each data

bit is followed by its complement. If the UART detects a

Manchester-encoding error in any received data character,

it will set the ALRTMAN bit in the STATUS register.

The parity is even, which means that the parity bit’s value

should always result in an even number of logic-one bits in

the character. Given that the data is Manchester encoded

and that there are two stop bits, the parity bit for data char-

acters is always transmitted as a logic-zero. If the UART

detects a parity error in any received data character it sets

the ALRTPAR bit in the STATUS register.

See Table 22 for a list of data characters and Figure 33 for

a graphical representation.

Table 22. Data Character

Figure 33. Data Characters

BIT

NAME

SYMBOL

DESCRIPTION

Start

First bit in character, always logic-zero

Data0

—

Least-significant bit of data nibble (true)

Data0/

—

Least-significant bit of data nibble (inverted)

Data1

—

Data bit 1 (true)

Data1/

—

Data bit 1 (inverted)

Data2

—

Data bit 2 (true)

Data2/

—

Data bit 2 (inverted)

Data3

—

Most-significant bit of data nibble (true)

Data3/

—

Most-significant bit of data nibble (inverted)

Parity

Always logic-zero (even parity)

Stop

Always logic-one

Stop

Last bit in character, always logic-one

IDLE

DISABLE

E = 0 P

OPTIONAL

IDLE

OPTIONAL

IDLE

DATA NIBBLE = 0h

E = 0 P

OPTIONAL

IDLE

OPTIONAL

IDLE

DATA NIBBLE = Ah

IDLE

DISABLE

IDLE

ENABLE

IDLE

ENABLE

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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