MAX17843 datasheet(94/131 Pages) MAXIM

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UART Supplemental ESD Protection

The UART ports may require supplemental protection to

meet IEC 61000-4-2 requirements for contact discharge.

The recommended circuits to meet ±8kV protection levels

are shown in Figures 64 and 65. The protection compo-

nents should be placed as near as possible to the signal’s

entry point on the PCB.

Single-Ended RX Mode

To configure the lower port for single-ended RX mode, the

RXLP input is connected to digital ground and the RXLN

input receives the inverted signal, just as it does for dif-

ferential mode. If the host cannot transmit inverted data

then the signal must be inverted as shown in Figure 66.

Transmitter operation is not affected. If the upstack device

is single-ended, so only the TXUN signal is required.

Note: in single-ended mode, SHDNL must be driven

externally; leave TXLP unconnected.

UART Isolation

The UART is expected to communicate reliably in noisy

high-power battery environments, where both high dV/dt

supply noise and common-mode current injection induced

by electromagnetic fields are prevalent. Common-mode

currents can also be induced by parasitic coupling of the

system to a reference node such as a battery or vehicle

chassis. The daisy-chain physical layer is designed for

maximum noise immunity.

Figure 65. External ESD Protection for UART RX Ports

Figure 66. Application Circuit for Single-Ended Mode

RXN

RXP

GNDL

2.2nF

600V

2.2nF

600V

15pF

50V

15pF

50V

100Ω

100kΩ

100Ω

PESD1CAN

FROM

TRANSMITTER

1.5kΩ

RXLP

RXLN

GNDL

15pF

1.5kΩ

UART

DATA

ISOLATED OR

NON-ISOLATED

INVERTING LOGIC

DRIVER

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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