SAP5SD-B-G1-R datasheet(43/63 Pages) ETC2

43 / 63 page

SAP5S / SAP51

Universal Actuator-Sensor Interface IC

Data Sheet

July 17, 2012

the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to

changes without notice.

43 of 62

UIN

U5R

tLOW

reset

about 15V

VPOR1F

VPOR1R

Figure 9: Power-On Behavior (all modes)

Note: The power-on reset circuit has a threshold voltage reference. This reference matches the process

tolerance of the logic levels and must not be very accurate. All values depend slightly on the raise and

fall time of the supply voltage.

4.13.2. Logic controlled Reset

The IC also becomes reset after reception of Reset_Slave or Broadcast_Reset commands, expiration of the

(enabled) Communication Watchdog or entering of a forbidden state machine state (i.e. due to heavy EMI).

4.13.3. External Reset

The IC can be reset externally by pulling the DSTBn pin LOW for more than a minimum reset time. The

external reset input function is provided in every operational mode of the IC – Slave Mode and

Master/Repeater Mode. The following signal timings apply:

Table 31: Timing of external reset

Symbol Parameter

Min

Max

Unit

Note

tnoRESET

DSTBn LOW time for no reset initiation

tRESET

Reset execution time,

DSTBn H/L transition to Hi-Z output drives at DO0...DO3, P0…P3

tINIT

State Machine initialization time after reset (E²PROM read out)

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