MAX17843ACB datasheet(95/131 Pages) MAXIM

95 / 131 page

The AC-coupled differential communication architecture

has a ±30V common-mode range and +6V differential

swing. This range is in addition to the static common-

mode voltage across the AC-coupling capacitors between

modules. Transmitter drivers have low internal impedance

and are source-terminated by the application circuit so

that impedances are well-matched in the high- and low-

driver states. This architecture minimizes differential noise

induced by common-mode current injection. The receiver

inputs are filtered above the fundamental communication

frequency to prevent high-frequency noise from entering

the device. The system is designed for use with isolation

transformers or optocouplers to provide an even higher

degree of common-mode noise rejection in circuit locations

where extremely large common-mode noise is present,

such as between vehicle chassis and high-voltage battery-

pack terminals.

Since a mid-pack service-disconnect safety switch is

present in many battery packs, the device is designed

to communicate with the entire daisy-chain, regardless

of whether the service-disconnect switch is engaged

or open. This is possible with daisy-chains that employ

capacitor isolation.

UART Transformer Isolation

The UART ports can be transformer-coupled because

of their DC-balanced differential design (see Figure 67).

Transformer coupling between the MAX17841B inter-

face and the MAX17843 provides excellent isolation

and common-mode noise rejection. The center tap of

a signal transformer can be used to enhance common-

mode rejection by AC-coupling the node to local ground.

Common-mode currents that are able to pass through

the parasitic coupling of the primary and secondary are

shunted to ground to make a very effective common-

mode noise filter.

Figure 67. UART Transformer Isolation

15pF

1.5kΩ

RXLP

TXP

47Ω

DAISY-CHAIN

DEVICE 1

1nF

SIGNAL TRACES

OR WIRE

HARNESS

TXN

GNDL

RXLN

GNDL

MAX17841

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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