HT6P237A/HT6P247A
Learning RF Encoder
Features
• Operating voltage: 2.0V ~3.6V
• Average Operating Current:
♦
♦
General Description
The HT6P2x7A devices form a series of data encoders
which include fully integrated ASK transmitters for
remote control system applications. These highly
integrated devices are true “switch-in, antenna-out”
monolithic devices. They encode 22 or 28 bits of
information and then serially transmits the data out
on their PAOUT pin upon receipt of transmission
enable (Data pins: D0~D3 or B0~B1) signals. They
encode address and data information into a coded
waveform suitable for modulation and transmission
using their integrated RF circuits. The devices offer
high performance in two areas: power delivery
and operating temperature. In terms of power, the
devices are capable of delivering +16 dBm into a 50Ω
load. This power level enables a small form factor
transmitter such as a key fob transmitter to operate
with a maximum distance. In terms of temperature,
they can operate from -40˚C to 85˚C with very little
frequency drift. They additionally offer exceptional
ease of use and can easily pass FCC/ETSI regulations.
One only needs a few additional components for
harmonic filtering. The devices are used with ASK/
OOK (Amplitude Shift Keying/On-Off Keyed) UHF
receiver types from wide-band super-regenerative
radios to narrow-band, high performance super-
heterodyne receivers to form a complete remote
system.
20mA @ V
DD
=3.0V, 12dBm;
30mA @ V
DD
=3.0V, 16dBm
• Standby current: 1.0μA (Max.) @ V
DD
=3V
• HT6P237A codes are fully compatible with
HT6P20B
• Up to 4 data pins
• Providing 2 compound data trigger pins
• Up to 2
24
address codes
• 8 bit time option via 2 pin selection
• Integrated complete UHF transmitter
• Frequency range 300MHz to 450MHz
• Supports ASK/OOK modulation
• 3 output power levels 12dBm/14dBm/16dBm via
1 pin selection
• Minimal external components
• 16-Pin NSOP package
Applications
• Burglar alarm systems
• Smoke and fire alarm systems
• Car alarm systems
• Garage door remote controllers
• Home Security systems
• Other remote control systems
Rev. 1.00
1
April 12, 2013
HT6P237A/HT6P247A
Block Diagram
V D D
O P S
D iv id e r
S y s te m
T im in g
X ta l
O s c illa to r
E n a b le
C o n tro l
X IN
X O U T
B T S
B T S
D
D
1
3
0
D a ta
L a tc h
2
D 1
D 0
B 0
B 1
C o n tro l
U n it
C o d e
G e n e r a tio n
M ix
A d d re s s /D a ta
3 2 *P L L
P A
P A O U T
V S S
D O U T
P V S S
Pin Assignment
2 2 A d d re s s + 2 D a ta
N C
B 0
B T S 1
B T S 0
O P S
V D D
6
7
8
H T 6 P 2 3 7 A
1 6 N S O P -A
V S S
P A O U T
5
4
3
2
1
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
B T S G S
V S S
D 1
D 0
D O U T
X O U T
X IN
P V S S
B 1
B 0
B T S 1
B T S 0
O P S
V D D
6
7
8
H T 6 P 2 4 7 A
1 6 N S O P -A
V S S
P A O U T
5
4
3
2
1
2 4 A d d re s s + 4 D a ta
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
D 3
D 2
D 1
D 0
D O U T
X O U T
X IN
P V S S
Selection Table
Part No.
V
DD
Addr. No. Data No.
22
24
2
4
Compound
Data No.
2
2
Trig.
Data Low
Data Low
Frequency Band
300MHz~450MHz
300MHz~450MHz
RF Type
ASK TX
ASK TX
Package
16NSOP
16NSOP
HT6P237A 2.0V~3.6V
HT6P247A 2.0V~3.6V
Rev. 1.00
2
April 12, 2013
HT6P237A/HT6P247A
Pin Description
Pin No.
1~2
3~4
5
6
7/15
8
9
10
11
12
13~16
16
Pin Name
B1~B0
BTS1~BTS0
OPS
VDD
VSS
PAOUT
PVSS
XIN
XOUT
DOUT
D0~D3
BTSGS
(HT6P237A only)
I/O
I
I
I
P
P
O
P
I
O
O
I
I
Internal
Connection
CMOS IN
CMOS IN
CMOS IN
—
—
Description
Compound pin – D0~D3 for B0 and D1~D2 for B1 in HT6P247A
Compound pin – D0~D1 for B0 in HT6P237A
Bit Time Select Pins Set to V
DD
, floating or ground to select 8 bit
width types
Output Power Select Pin. Set to V
DD
, floating or ground to select
one of 3 power output levels
V
DD
: 16dBm, Floating: 14dBm, Gnd: 12dBm
Positive power supply
Negative power supply, ground
Pin 15 in the HT6P237A should be grounded
Power Amplify
L/C matching circuit
Output
—
Oscillator
Oscillator
CMOS OUT
CMOS IN
CMOS IN
RF negative power supply, ground
13.56MHz Crystal oscillator input for 433.92MHz RF
13.56MHz Crystal oscillator output for 433.92MHz RF
Encoder data out
Data input and transmission enable; active low
Bit time group select
0: Bit time group 1
1: Bit time group 2
This pin must be either high or low and not allowed to float
Approximate Internal Connections
C M O S IN /O U T
C M O S O U T
C M O S IN P u ll- h ig h
V
D D
O s c illa to r
Rev. 1.00
3
April 12, 2013
HT6P237A/HT6P247A
Absolute Maximum Ratings
Logic Supply Voltage ................V
SS
-0.3V to V
SS
+3.6V
Logic Input Voltage ................. V
SS
-0.3V to V
DD
+0.3V
.
Logic Output Voltage ............... V
SS
-0.3V to V
DD
+0.3V
Note: These are stress ratings only. Stresses exceeding the range specified under ”Absolute Maximum Ratings”
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.
Storage Temperature ............................ -55˚C to 150˚C
Operating Temperature .......................... -40˚C to 85˚C
D.C. Characteristics
Symbol
V
DD
I
SB
V
IH
V
IL
R
PL
I
OH
I
OL
Parameter
Logic Supply Voltage
Stand-by current
“H” Input Voltage
“L” Input Voltage
Pull-high Resistance
Hi-level output current
Low-level output current
Test condition
V
DD
—
3
—
—
3
3
3
D0~D3, B0~B1
V
OH
=0.9V
DD
; D
OUT
V
OL
=0.1V
DD
; D
OUT
condition
—
No load. Input pins floating
—
—
Min.
2.0
—
0.8V
DD
—
—
—
—
Typ.
3
—
—
—
500
7
2
Ta=25°C
Max.
3.6
1.0
—
0.2V
DD
—
—
—
Unit
V
μA
V
V
kΩ
mA
mA
R.F. Characteristics
P
I
1
I
0
Parameter
Average Data Current*
(Data is 50% duty cycle)
Data LOW current
Specifications apply for V
DD
=3.0V, T
A
=25°C, Freq 433MHz unless otherwise noted. RL 50Ω load (matched)
Test Conditions
V
DD
3V
3V
Conditions
@ 433MHz, POUT=+16dBm
@ 433MHz, POUT=+12dBm
—
0
Min
—
—
—
—
—
—
—
—
—
—
—
—
Typ
21
12
5
12
14
16
76
1800
1
-50
-51
<1000
-70
-75
15
Max
—
—
—
—
—
—
—
—
—
—
—
—
dBc
μs
μs
dBc
kHz
dBc/Hz
pF
dBm
Units
mA
mA
RF and Crystal
Output power level
Extinction ratio for ASK
10Kbps
Output Blanking
ASK to RF Out Response
Time
Harmonic output for
433.92 MHz
Occupied Bandwidth
433.92 MHz Single Side
Band Phase Noise
XTLIN, XTLOUT
3V
3V
OPS
—
Delta between ASK Input Transition from Low to
High to RF Output Transition from Low to High
@867.84MHz, 2nd harm
@1301.76MHz, 3rd harm
@100kHz from Carrier
@1000kHz from Carrier
Floating
1
3V
STDBY transition from Low to High
3V
3V
3V @433.92MHz
3V
3V Pin capacitance
Note: It is recommended that VDD power on stability time should be less than 500μs to allow the device to operate
normally.
Rev. 1.00
4
April 12, 2013
HT6P237A/HT6P247A
Functional Description
The devices encode both address and data information
into an encoded waveform and output it on DOUT.
This waveform is fed to the RF modulator for
transmission purposes.
Code bits
A code bit is the basic component of the encoded
waveform, and can be classified as either an address/data
bit or a pilot-code which is a synchronous bit.
Normal Operation
The devices encode and transmits the address/data
information to a decoder upon receipt of a trigger
signal. The transmission function of the series are
enabled by the data inputs, which are the active low
pins D0~D3 and B0~B1. The following diagram
shows the transmission timing of these devices.
D0~D3, B0, B1
1ms
(typ.)
Address/Data bit waveform
An address/data bit can be designated as either a ”0”
or “1” bit depending upon its waveform type. A one
bit waveform consists of one pulse cycle, as shown in
the following diagram.
1λ
2λ
Bit “0”
t
DW
1λ
2λ
DOUT
Pilot Address/Data/End
code code
Bit “1”
Address/Data bit
The transmission sequence is Pilot, Address, Data,
End code.
D0~D3, B0, B1
< 1 pilot code 1pilot code<Active<1 code word
> 1 code word
Note: 1. A “0” consists of a “low” pulse for 1λ then a
“high” pulse for 2λ.
2. A “1” consists of a “low” pulse for 2λ then a
“high” pulse for 1λ.
One-Bit Data Width
There are 8 different one-bit data widths as shown in
the following table. They are selected by the control
pins BTS1 and BTS0. In the table “F” refers to a
floating input level.
Pin condition
0/0
0/F
0/1
F/0
BTS1/BTS0
F/F
F/1
1/0
1/ F
1/1
Group 1
1.1
1.2
1.3
1.4
1.5
1.6
1.76
1.9
NC
Group2
0.4
0.5
0.6
0.7
0.8
0.9
2.0
2.1
NC
—
ms
Unit
DOUT
1 code word
Transmission Timing Diagram
Symbol
Parameter
t
DW
One bit data width
(t
DW
) @433.92MHz
Note: 1. Group2 is only available for the HT6P237A.
2. The BTS0 and BTS1 pins can be set either high, low or floating.
3. The BTS0 and BTS1 pins should never be both high as this may cause erroneous operation.
4. If there is an overlap bit time range then select the closest typical bit time. For example if the desired bit
time is 1.46ms, choosing the 1.5ms setting is best.
5. For other frequencies, the bit time will be the ratio of 433.92/freq. For example, for a frequency of
315MHz, the bit time 1.1ms will be 1.1×433.92/315=1.51ms.
Rev. 1.00
5
April 12, 2013
