SAP51D-B-G1-R datasheet(42/63 Pages) ETC2

42 / 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.

42 of 62

4.12. Oscillator Pins OSC1, OSC2

Table 28: Oscillator pin parameters

Symbol

Parameter

Min

Max

Unit

Note

VOSC_IN

Input voltage range

-0.3

VU5R

COSC

External parasitic capacitor at oscillator pins OSC1, OSC2

CCRYSTAL

Crystal load capacitance

VIL

Input ”low” voltage

1.5

VIH

Input ”high” voltage

3.5

VU5R

1 for external clock applied to OSC1

The oscillator supports direct connection of 5.33 MHz or 16.000 MHz crystals with a dedicated load capacity

of 12pF and parasitic pin capacities of up to 8pF. The IC automatically detects the oscillation frequency of the

connected crystal and controls the internal clock generator circuit accordingly. The oscillator unit also contains

a clock watch dog circuit that can generate an unconditioned IC reset if there was no clock oscillation for more

than about 20µs. This is to prevent the IC from unpredicted behavior if no clock signal is available anymore.

4.13. IC Reset

Any IC reset turns the Data Output and Parameter Output Registers to 0xF and forces the corresponding

output drivers to high impedance state. Except at Power On Reset, Data Strobe and Parameter Strobe signals

are simultaneously generated to visualize possibly changed output data to external circuitry.

The Data_Exchange_Disable flag becomes set during IC reset, prohibiting any data port activity right after IC

initialization and as long as the external circuitry was not pre-conditioned by decent parameter output data.

Consequently the AS-i master has to send a Write_Parameter call in advance of the first Data_Exchange

request to an initialized slave. Following IC initialization times apply:

Table 29: IC Initialization times

Symbol Parameter

Min

Max

Unit

Note

tINIT

Initialization time after Software Reset (generated by master

calls Reset_Slave or Broadcast_Reset) or external reset via

DSTBn

tINIT2

Initialization time after power on

tINIT3

Initialization time after power on with high capacitive load

1000

1 guaranteed by design

2 ‘power on’ starts latest at V

UIN = 18V, external capacitor at pin UOUT less than or equal 10µF

3 C

UOUT = 470µF, tINIT3 is guaranteed by design only

4.13.1. Power On Reset

In order to force the IC into a defined state after power up and to avoid uncontrolled switching of the digital

logic if the 5V supply (U5R) breaks down below a certain minimum level, a Power On Reset is executed under

the following conditions:

Table 30: Power On Reset Threshold Voltages

Symbol Parameter

Min

Max

Unit

Note

VPOR1F

VU5R voltage to trigger internal reset procedure, falling voltage

1.2

1.7

VPOR1R

VU5R voltage to trigger INIT procedure, rising voltage

3.5

4.3

tLow

Power-on reset pulse width

µs

1 guaranteed by design

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