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SR176 Datasheet(PDF) 27 Page - STMicroelectronics

Part # SR176
Description  13.56 MHz, 176-bit short range contactless user EEPROM with 64-bit Unique ID
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SR176 Datasheet(HTML) 27 Page - STMicroelectronics

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SR176
DC and ac parameters
27/35
8
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
TA
Ambient operating temperature
Wafer
–20
85
°C
A3, A4, A5
–20
85
°C
Table 7.
DC characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
VCC
Regulated voltage
2.5
3.5
V
VRET
Retromodulation induced voltage
ISO 10373-6
20
mV
CTUN
Internal tuning capacitor
13.56 MHz
64
pF
Table 8.
AC characteristics(1)
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.
Symbol
Parameter
Condition
Min
Max
Unit
fCC
External RF signal frequency
13.553
13.567
MHz
MICARRIER Carrier modulation index
MI=(A-B)/(A+B)
10
14
%
tRFR,tRFF
10% rise and fall time
10% to 90%
0.5
1.5
µs
tRFSBL
10% modulation pulse width
ETU = 128/fCC
9.44
µs
tJIT
ASK modulation data jitter
Coupler to SR176
- 2
+ 2
µs
tMIN CD
Minimum time from carrier
generation to first data
From H-field Min
40
µs
fS
Subcarrier frequency
fCC/16
847.5
kHz
t0
Antenna reversal delay
128/fS
151
µs
t1
Synchronization delay
128/fS
151
µs
t2
Answer to new request delay
14 ETU
132
µs
tDR
Time between request
characters
Coupler to SR176
0
57
µs
tDA
Time between answer
characters
SR176 to Coupler
0
µs
tW
Programming time for WRITE
5
ms



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