25 July 1996
Micro-reader Module
4.2 Recommended Operating Conditions
Symbol
Parameter
Min.
Typ.
Max.
Unit
V_VSP
Supply voltage for power stage
4.5
5.0
5.5
V
V_VSL
Supply voltage for logic
4.5
5.0
5.5
V
I_VSP
Supply current for power stage
110*
1
mA
I_VSL
Supply current for logic
30*
2
mA
I_su
Output current sunk by an output pin
5.0
15.0
mA
I_so
Output current sourced by an output pin
5.0
15.0
mA
I_sutot
Output current sunk by all output pins
20.0
60.0
mA
I_sotot
Output current sourced by all output pins
20.0
60.0
mA
V_ret
VSP start voltage to guarantee power on
reset
GND
Vrise_ret
VSP rise rate to guarantee power on reset
0.1
V/ms
I_idle
Supply current with Micro-reader idle
5.0
mA
I_act
Supply current with Micro-reader active
100*
3
mA
ViH
Input high voltage
0.8 VSL
VSL
ViL
Input low voltage
GND
0.2 VSL
VoH
Output high voltage
VSL - 0.7
VSL
VoL
Output low voltage
GND
0.6
V
Q_Ant
Antenna quality factor
10
15
20
L_Ant
Antenna inductance value
46.1
47.0
47.9
µ
H
*
1
Typical supply current (peak value) for the power stage when the RF transmitter is
switched on (L = 47
µ
H, Q = 12).
*
2
Typical supply current for logic when the RF transmitter is switched on.
*
3
Typical supply current (average value) of the Micro-reader when the RF transmitter is
switched on (L = 47
µ
H, Q = 12).
4.3 Timings
Parameter
Typical
Maximum
Unit
Read Cycle time without synch (no read)
100
105
ms
Read Cycle time with synch (no read)
120
175
ms
Read Cycle time without synch (valid read)
170
175
ms
Read Cycle time with synch (valid read)
190
245
ms
Interbyte time-out for serial communication
10*
1
ms
*
1
If an Interbyte time-out occurs the Micro-reader performs a reset.
