HT672B データシートの表示（PDF） - Holtek Semiconductor
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HT672B Datasheet PDF : 8 Pages
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HT672B
Absolute Maximum Ratings
Supply Voltage (VDD) ............................................5.5V
Supply Voltage (VPA) ..........................................12.5V
Input Voltage .............................VSS-0.3V to VDD+0.3V
Storage Temperature ...........................-50°C to 125°C
Operating Temperature ..............................0°C to 70°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Electrical Characteristics
Symbol
Parameter
VDD
IDD
IDD
Rm
VLCL
BR
Operating Voltage
Operating Current
Operating Current
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
Min. Typ. Max. Unit
2
3
4
V
¾
15
¾
mA
¾ 400
¾
mA
¾ 320 ¾
W
¾
6.5
¾
V
5
10
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 internal RC-oscillator, the tran-
sponder is actuated to transmit its internal data serially
by means of damping the LC tank.
The reader receiving the transponder¢s data by means
of detecting the energy variation on it¢s own antenna,
and recognize the information with a microcontroller.
The HT672B 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 40 bits of OTP memory space is provided,
from which 20 bits wide are customer programmable,
which can be programmed using the specified program-
mer supplied by Holtek. The pre-programmed Ics are
also available upon customer¢s request.
T ra n s p o n d e r
H T672B
E n e rg y
D a ta
R eader
R F osc
&
C o n tr o lle r
Rev. 1.10
3
November 23, 2004
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