S-wire protocol

STODD01

10/31

Doc ID 17789 Rev 2

6

S-wire protocol

Note:

These are recommended values for proper operation of the S-wire interface.

The S-wire input pin is able to detect pulses also outside these ranges. Consequently, care

must be taken to avoid noise injected into the S-wire pin.

Table 8.

Timing

Parameter

Symbol

Min.

Typ.

Max.

Unit

300

500

µs

S-Wire signal stop (see Figure 5, 6, 7, 8)tSW_STOP

300

500

µs

270

µs

S-Wire high (see Figure 5, 6, 7, 8)tSW_H

25

50

µs

S-Wire low (see Figure 5, 6, 7, 8)tSW_L

25

50

µs

200

ns

S-Wire falling time (see Figure 4)tSW_F

200

ns

FB Voltage delay

20

µs

1.6

V

S-Wire threshold low (see Figure 4)VSW_TL

00.4

V

Figure 4.

S-wire pulse thresholds

T

SW_R

T

SW_F

10%

90%

V

SW_TL

V

SW_TH

AM07818v1

T

SW_R

T

SW_F

10%

90%

V

SW_TL

V

SW_TH

AM07818v1