MAX17843 datasheet(92/131 Pages) MAXIM

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UART Interface

The UART pins also employ both internal and external cir-

cuits to protect against noise. The recommended external

filters are shown in Figure 62. ESD protection is shown in

Figure 64 and Figure 65.

High-Z Idle Mode

The high-Z idle mode lowers radiated emissions from wire

harnesses by minimizing the charging and discharging of

the AC-coupling capacitors when entering and exiting the

idle mode. The application circuit shown in Figure 63 uses

a weak resistor-divider to bias the TX lines to VDDL during

the high-Z idle period and pnp transistor clamps to limit

the maximum voltage at the TX pins during high noise

injection. The resistor-divider and pnp clamps are not

needed for applications utilizing only the low-Z mode. The

low-Z and high-Z idle modes both exhibit a similar immu-

nity to noise injection. Low-Z mode may be preferred for

ports driving inductive loads to minimize ringing.

Figure 62. UART Connection

TXLN

TXLP

R44

47Ω

R45

47Ω

C50

2.2nF 600V

C51

2.2nF 600V

C52

15pF

C53

15pF

R52

100kΩ

R53

100kΩ

DAISY-CHAIN

DEVICE (n)

DAISY-CHAIN

DEVICE (n-1)

SIGNAL TRACES

OR WIRE

HARNESS

TXUN

TXUP

R50

47Ω

R51

47Ω

RXLN

RXLP

C42

2.2nF

600V

C43

2.2nF

600V

C40

15pF

C41

15pF

R42

100kΩ

R43

100kΩ

SIGNAL TRACES

OR WIRE

HARNESS

R54

1.5kΩ

R55

1.5kΩ

R40

1.5kΩ

R41

1.5kΩ

GNDL

RXUP

RXUN

GNDL

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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