MAX17841BGUE datasheet(24/33 Pages) MAXIM

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UART Transformer Coupling

The UART signals can be transformer-coupled because

oftheDC-balancedsignaling.Placinganisolationtrans-

former between the UART’s transmitter and the slave

device’s receiver provides common-mode isolation for

the case where the slave device is operating at a different

voltage level.

When no data is being transmitted (idle state), the trans-

mitter drives both outputs to a logic low level to prevent

any current flow through the transformer winding.

A common-mode noise filter can be implemented by

capacitively coupling the center tap of the transformer on

the transmitter side to the UART ground. Any common-

mode noise that passes through the transformer is effec-

tively shunted to ground.

UART Supplemental ESD Protection

The UART transmitter and receiver, with supplemental

protection diodes as shown in the application circuits, can

beusedforenhancedESDprotection.Thediodesshould

be placed as close as possible to the external connector.

Figure 14. Transformer Coupling of UART Signals

Figure 15. Supplemental ESD Protection for UART Transmitter

Figure 16. Supplemental ESD Protection for UART Receiver

(Shown with Capacitive Coupling)

RXLP

MAX178XX

BATTERY MANAGEMENT

DEVICE

MAX17841B

1.5kΩ

47Ω

1.5kΩ

15pF

RXLN

GNDL

TXP

TXN

GNDL

10nF

TXP

47Ω

TXN

GNDL

PESD1CAN

RXP

1.5kΩ

100kΩ

1nF

600V

15pF

50V

15pF

50V

1nF

600V

RXN

GNDL

PESD1CAN

Maxim Integrated │ 24

MAX17841B

Automotive SPI Communication Interface (ASCI)

MAX17841BGUE Datasheet(PDF) 24 Page - Maxim Integrated Products

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