HT6740 Просмотр технического описания (PDF) - Holtek Semiconductor
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производитель
HT6740 Datasheet PDF : 8 Pages
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Electrical Characteristics
Symbol
Parameter
VDD
Operating Voltage
Idd
Operating Current
Rm
VLCL
BR
Modulation Resistance
LC Input Limiter Voltage
Output Data Baud Rate
Test Conditions
VDD
Conditions
¾ VDD pad voltage
2V
¾
3V
¾
3.3V
¾
¾
¾
3V VDD vs VSS
HT6740
Min. Typ. Max. Unit
2.0
3
¾
15
¾ 400
¾ 320
¾ 6.5
5
10
4
V
¾
mA
¾
mA
¾
W
¾
V
15 Kbps
Functional Description
Operation Concept
The reader transmits a 13.56MHz carrier signal from its
antenna, the LC tank on the transponder side converts
the carrier energy to voltage form and supply to the tran-
sponder chip with an internal pump circuit. If the induced
energy is high enough, the pumped voltage reaches the
break-in voltage of the internal RC-oscillator, the tran-
sponder is actuated to transmit its internal data serially
by means of damping the LC tank.
The reader receives the transponder¢s data by means of
detecting the energy variation on its own antenna, and
recognize the information with a microcontroller.
The HT6740 has a built-in internal Voltage Limiter to
prevent excess power supply and RF levels induced by
the LC tank from damaging the device or causing the
device to function abnormally.
A total of 23 bits of OTP memory space is provided, from
which 6 bits wide are customer programmable, which
can be programmed using the specified programmer
supplied by Holtek. The pre-programmed ICs are also
available upon customer¢s request.
Anti-Collision Function
HT6740 build in anti-collision function. The probability
which reader could ²find² all (ex.5 tags): Under 10K
baud rate. During 103ms®0.8293; During 308ms
®0.9950; During 408ms®0.9992 and during 510ms is
0.99995.
Option Function
Option 0: 0 continuous (Default)
1 anti-collision
T ra n s p o n d e r
E n e rg y
R eader
H T6740
D a ta
R F osc
&
C o n tr o lle r
Timing & Code Package
S y n c . D a ta
( 5 b its )
C u s to m e r ID
( 6 b its )
P ro d u c t
C ode
( 6 b its )
C heck
S um
T o ta l E P R O M s p a c e ( 1 7 b its )
Rev. 1.20
3
May 17, 2007
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