STODD01 datasheet(10/31 Pages) STMICROELECTRONICS

10 / 31 page

S-wire protocol

STODD01

10/31

Doc ID 17789 Rev 2

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

S-Wire signal start (see Figure 5, 6, 7, 8)tSW_START

300

500

µs

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

300

500

µs

S-Wire signal off (see Figure 5, 6, 7, 8)tSW_OFF

270

µs

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

µs

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

µs

S-Wire rising time (see Figure 4)tSW_R

200

S-Wire falling time (see Figure 4)tSW_F

200

FB Voltage delay

tSW_DELAY

µs

S-Wire threshold high (see Figure 4)VSW_TH

1.6

VIN

S-Wire threshold low (see Figure 4)VSW_TL

00.4

Figure 4.

S-wire pulse thresholds

SW_R

SW_F

10%

90%

SW_TL

SW_TH

AM07818v1

SW_R

SW_F

10%

90%

SW_TL

SW_TH

AM07818v1

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