AS8520 datasheet(23/34 Pages) AMSCO

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AS8520

Preliminary Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

Figure 10. RX Output Circuitry

8.6 MODE Input EN

The AS8520 is switched from normal mode to the standby/sleep mode with a falling edge on EN and keeping TX high for TSTNDY_trigger time.

Device is switched from standby mode to normal mode with a rising edge at the EN pin. The mode change for AS8520 with a falling edge at EN

can be done independently from the state of the bus transceiver. Device enters into Serial port mode (for factory test purpose only) by forcing EN

low and driving TX high to low within Ttx_SP_trigger time after EN forced to low.

This ensures the direct control of device to enter into Standby/Sleep mode by microcontroller using EN pin.

Figure 11. EN Pin Functionality

The EN input has an internal active pull down to secure that if this pin is not connected, a low level will be generated.

MCU

AS8520

VCC

LEN1 LEN0

Normal Mode

Normal

Mode

Serial Port

Mode

Normal

Mode

Standby/Sleep

Mode

Entry into

Serial Port

Mode

Ttx_su

Ttx_hd

Ttx_su

Ttx_SP_trigger

TSTNDY_trigger

Ten_ENSCLK

AS8520 Datasheet(PDF) 23 Page - ams AG