HOLTEK HT6720

HT6720
13.56MHz RFID Transponder
Features
· Very low operating current (4mA @ VDD=3V)
· OTP data memory
· Wide range operating voltage
· 13.56MHz carrier frequency
· Batteryless RF transponder
· Output data baud rate: 4kbps (Typ.) @ VDD=3V
· Data transmission in read-only operation
· PWM/ASK modulation
· Max. of 64-bits customer programmable data
· Built-in voltage limiter
· 16-bits CRC error detection code
Applications
· Interactive leisure products
· Material management
· Security system
· Animal management
· Access control
· Personnel working time record
· Anti-counterfeit devices
· Car park monitoring system
General Description
The transmission information is stored in a 96 bits one
time programmable memory OTP, with a 16-bit CRC
code (up to 64 bits reserved for customer). The effective
detection range for a small sized antenna is 2cm~10cm
which is dependent on antenna format & reader design.
The larger the antenna loop used the longer the detection range. It is advisable to use larger antenna to attain
a 15 cm detection range.
The HT6720 is an RF transponder IC with 13.56MHz RF
carrier, which provides a low cost batteryless transponder solution when combined with an external inductor. The inductor and internal capacitor form an LC
tank which induce voltage from the radiated 13.56MHz
carrier signal generated from the reader antenna.
HT6720 has a built-in low power RC oscillator which is
activated if the induced carrier field strength is high
enough to supply the operating current and the response signal (pre-programmed in the OTP memory) is
serially transmitted out. The response data is transmitted using PWM/ASK modulation. Modulation of
13.56MHz is accomplished by damping the LC tank with
a fixed baud rate.
Implementing Holtek¢s advanced OTP and low power
technology, HT6720 offers a very cost effective solution
for RF contactless detection system.
A code area of 64-bits (max.) wide is provided so customers can program the device using the specified programmer supplied by Holtek. The pre-programmed ICs
are also available upon customer¢s request.
Block Diagram
H F 2
S y s te m
C lo c k
G e n e ra to r
V C C
L im ite r
a n d
R F L im ite r
D a ta
P r o c e s s in g
H F 1
P W M /A S K
M o d u la to r
S h ift
R e g is te r
D a ta
E P R O M
V D D
P o w e r O N
R e s e t
T e s t a
E P R O
P ro g ra m
C o n tr
V P A
Rev. 1.00
1
n d
M
m in g
o l
V S S
C L K
August 13, 2001
HT6720
Pad Assignment
H F 2
V D D
V P A
1
6
5
(0 ,0 )
2
3
4
H F 1
V S S
C L K
Chip size: 925´1040 (mm)2
* The IC substrate should be connected to VSS in the PCB layout artwork.
Pad Coordinates
Unit: mm
Pad No.
X
1
2
3
Y
Pad No.
X
Y
-256.65
357.34
4
228.70
-256.65
96.10
-361.99
5
219.80
-361.37
338.59
-378.15
6
88.89
332.15
Pad Description
Pad No. Pad Name
I/O
Internal
Connection
Description
1
HF2
I/O
CMOS
Connect to an antenna coil for normal operation. Open for data programming.
2
HF1
I/O
CMOS
Connect to an antenna coil for normal operation. Data I/O for programming.
3
VSS
¾
¾
4
CLK
I
CMOS
5
VPA
I
¾
Open for normal operation. High voltage supplies input for programming.
6
VDD
¾
¾
Open for normal operation, +5V supply input for programming.
Negative power supply, ground
Open for normal operation. Clock input for programming.
Absolute Maximum Ratings
Supply Voltage (VDD) ...............................................6V
Storage Temperature ...........................-50°C to 125°C
Supply Voltage (VPA) ..........................................13.5V
Operating Temperature ..............................0°C to 70°C
Input Voltage .............................VSS-0.3V to VDD+0.3V
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 reliability.
Rev. 1.00
2
August 13, 2001
HT6720
Electrical Characteristics
Symbol
VDD
Test Conditions
Parameter
Operating Voltage
¾
VDD pad voltage
3V
Idd
Operating Current
Rm
Modulation Resistance
VLCL
LC Input Limiter Voltage
BR
Conditions
VDD
5V
¾
Voltage limiter not started
5V
¾
Typ.
Max.
Unit
2.4
¾
5
V
¾
4
¾
mA
¾
10
¾
mA
¾
320
¾
W
¾
6.5
¾
V
3V
VDD vs VSS
¾
4
¾
Kbps
5V
VDD vs VSS
¾
5.5
¾
Kbps
¾
Output Data Baud Rate
Min.
¾
Functional Description
The HT6720 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.
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 transponder 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 transponder is actuated to transmit its internal data serially
A total of 96 bits of OTP memory space is provided, from
which 64 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.
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.
T ra n s p o n d e r
E n e rg y
R e a d e r
R F o s c
&
C o n tr o lle r
H T 6 7 2 0
D a ta
Timing & Code Package
T ra n s p o n d e r
H T 6 7 2 0
D a ta O u t
* C u s to m e r P r o g r a m m a b le
C o d e A r e a ( 6 4 b its M a x .)
( 8 b its )
( 8 b its )
( 8 b its )
A g e n t ID
( H o lte k d e fin e d )
C u s to m e r ID
( A g e n t d e fin e d )
( 5 6 b its )
C a te g o ry ID
P ro d u c t ID
( C u s to m e r d e fin e d ) ( C u s to m e r d e fin e d )
( 1 6 b its )
C R C
P r o d u c t D a ta ( 6 4 b its )
T o ta l E P R O M
Rev. 1.00
3
s p a c e ( 9 6 b its )
August 13, 2001
HT6720
Code Package
Customer ID: This area is for the Agent, for example
used to store current number of customer.
A total of 96 bits information can be stored in the
HT6720, from which 64 bits are customer programmable.
Category ID: Can be used to store the application field
information code.
Agent ID: This 8-bit wide code is not customer programmable and is supplied together with the data writer after
registering to Holtek. The writer generates the code automatically.
Product ID: Storing the contents of the user ID number
or data.
Data CRC: A 16 bits of CRC code is generated automatically by the writer.
Application Circuits
Tag
A tag consists of a PCB (or Mylar film) with printed coil, HT6720 and a housing. The housing can be of various shapes.
T a g H o u s in g
P C B
H F 2
H F 1
Note:
H T 6 7 2 0
The value of the antenna inductance is 11mH, however the optimum value will be changed slightly due to the
variation of the internal resonance capacitor (10pF typically) during process.
For more application information about the reader, refer to Holtek¢s 13.56MHz RF ID reader data.
2-chip solution
H o lte k T r a n s p o n d e r S o lu tio n
H o lte k R e a d e r S o lu tio n
O th e r C o n tr o lle r
E n e rg y
H T 6 7 2 0
R F o s c
&
R e c e iv e r
A N T
A N T
D a ta
D e c o d e
&
S y s te m
C o n tro l
S p e c ia l
P u rp o s e
C o n tr o lle r
D a ta
H o lte k lo w c o s t M C U :
H T 4 8 R 0 5 A /H T 4 8 R 0 6 A
Rev. 1.00
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August 13, 2001
HT6720
1-chip solution (I)
H o lte k T r a n s p o n d e r S o lu tio n
H o lte k R e a d e r S o lu tio n
E n e rg y
H T 6 7 2 0
R F o s c
&
R e c e iv e r
A N T
A N T
D a ta
D e c o d e
&
S y s te m
C o n tro l
F u n c tio n
C o n tro l
D a ta
H o lte k S ta n d a r d M C U :
H T 4 8 X X X /H T 4 9 X X X
1-chip solution (II)
H o lte k T r a n s p o n d e r S o lu tio n
H o lte k R e a d e r S o lu tio n
E n e rg y
H T 6 7 2 0
R F o s c
&
R e c e iv e r
A N T
A N T
D a ta
D e c o d e
&
S y s te m
C o n tro l
F u n c tio n
C o n tro l
D a ta , V o ic e
o r L C D
D is p la y
P r o c e s s in g
D a ta
H o lte k E m b e d d e d M C U :
H T 2 1 X X X /H T 8 4 X X X /H T 8 6 X X X
Rev. 1.00
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August 13, 2001
HT6720
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor Inc. (Shanghai Sales Office)
7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233
Tel: 021-6485-5560
Fax: 021-6485-0313
http://www.holtek.com.cn
Holtek Semiconductor Inc. (Shenzhen Sales Office)
43F, SEG Plaza, Shen Nan Zhong Road, Shenzhen, China 518031
Tel: 0755-8346-5589
Fax: 0755-8346-5590
ISDN: 0755-8346-5591
Holtek Semiconductor Inc. (Beijing Sales Office)
Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031
Tel: 010-6641-0030, 6641-7751, 6641-7752
Fax: 010-6641-0125
Holmate Semiconductor, Inc. (North America Sales Office)
46712 Fremont Blvd., Fremont, CA 94538
Tel: 510-252-9880
Fax: 510-252-9885
http://www.holmate.com
Copyright Ó 2001 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Rev. 1.00
6
August 13, 2001