SAP5SD-A-G1-T Datasheet, PDF (29/63 Pages) List of Unclassifed Manufacturers – Universal Actuator-Sensor Interface IC

SAP5S / SAP51
Universal Actuator-Sensor Interface IC
4.1.2. Input Impedance (AS-i bus load)
Table 13: AS-i Bus Load Properties
Symbol Parameter
Min
Max
Unit Note
R_IN1
L_IN1
C_IN1
R_IN2
L_IN2
C_IN2
C_Zener
Equivalent resistor of the IC
Equivalent inductor of the IC
Equivalent capacitor of the IC
Equivalent resistor of the IC
Equivalent inductor of the IC
Equivalent capacitor of the IC
Parasitic capacitance of the external
over-voltage protection diode (Zener
13,5
13,5
13,5
12
k
1,2
mH
1,2
30
pF
1,2
k
1,2
13,5
mH
1,2
15 + (L-12mH)*10pF/mH pF ^1,2
20
pF
1
diode)
1 _{The equivalent circuit of a slave, which is calculated from the impedance of the IC and the paralleled external}
over-voltage protection diode (Zener diode), has to satisfy the requirements of the AS-i Complete
Specification for Extended Address Mode slaves.
2 _{Subtracting the maximum parasitic capacitance of the external over voltage protection diode (20pF) either}
the triple R_IN1, L_IN1 and C_IN1 or the triple R_IN2, L_IN2 and C_IN2 has to be reached by the IC to fulfill the AS-i
Complete Specification.
Table 14: CDC pin parameters
Symbol
V_{CDC_IN}
C_CDC
Parameter
Input voltage range
External decoupling capacitor
Min Typ Max Unit
-0.3
V_U5R
V
100
nF
Note
Note: A decoupling capacitor defines internal low-pass filter time constant; lower values decrease the
impedance but improve the turn-on time. Higher values do not improve the impedance but do increase
the turn-on time. The turn-on time also depends on the load capacitor at UOUT. After connecting the
slave to the power the capacitor is charged with the maximum current I_UOUT. The impedance will
increase when the voltage allows the analog circuitry to fully operate.
4.2. Thermal Protection
The IC continuously observes its silicon die temperature. If the temperature rises above around 140°C for
more than 2 seconds the IC will cut off the UOUT output from the internal voltage reference. Thus the current
consumption of the IC will drop down to its operating current (refer to Table 2). In order to prevent an
undesired drawing of transmit current the transmitter is also disabled in case the over temperature cut off
condition is true.
After over temperature cut off, the output voltage at UOUT will be restored and the IC performs an initialization
if the die temperature has cooled down by 10 … 20°C with an additional time delay of 1s.
Table 15: Cut Off Temperature
Symbol Parameter
T_CutOff Chip temperature for over temperature cut off
Min Max Unit Note
125 160 °C
Data Sheet
July 17, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 3.1
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