SR176_07 Datasheet, PDF (27/35 Pages) STMicroelectronics – 13.56 MHz, 176-bit short range contactless user EEPROM with 64-bit Unique ID

SR176
8
DC and ac parameters
DC and ac parameters
This section summarizes the operating and measurement conditions, and the dc and ac
characteristics of the device. The parameters in the dc and ac characteristic tables that
follow are derived from tests performed under the Measurement Conditions summarized in
the relevant tables. Designers should check that the operating conditions in their circuit
match the measurement conditions when relying on the quoted parameters.
Table 6. Operating conditions
Symbol
Parameter
Min.
Max.
Unit
Wafer
–20
85
°C
T_A
Ambient operating temperature
A3, A4, A5
–20
85
°C
Table 7.
Symbol
DC characteristics
Parameter
Condition
Min Typ Max Unit
V_CC
V_RET
C_TUN
Table 8.
Regulated voltage
Retromodulation induced voltage
Internal tuning capacitor
AC characteristics⁽¹⁾
2.5
3.5 V
ISO 10373-6
20
mV
13.56 MHz
64
pF
Symbol
Parameter
Condition
Min
Max Unit
f_CC
MI_CARRIER
t_RFR, t_RFF
t_RFSBL
t_JIT
t_{MIN CD}
External RF signal frequency
Carrier modulation index
10% rise and fall time
10% modulation pulse width
ASK modulation data jitter
Minimum time from carrier
generation to first data
MI=(A-B)/(A+B)
10% to 90%
ETU = 128/f_CC
Coupler to SR176
From H-field Min
13.553 13.567 MHz
10
14
%
0.5
1.5
µs
9.44
µs
-2
+2
µs
40
µs
f_S
Subcarrier frequency
t₀
Antenna reversal delay
t₁
Synchronization delay
t₂
Answer to new request delay
t_DR
Time between request
characters
f_CC/16
128/f_S
128/f_S
14 ETU
Coupler to SR176
847.5
kHz
151
µs
151
µs
132
µs
0
57
µs
t_DA
Time between answer
characters
SR176 to Coupler
0
µs
t_W
Programming time for WRITE
5
ms
1. All timing measurements were performed on a reference antenna with the following characteristics:
External size: 75 mm x 48 mm
Number of turns: 3
Width of conductor: 1 mm
Space between 2 conductors: 0.4 mm
Value of the coil: 1.4 µH
Tuning Frequency: 14.4 MHz.
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