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PDF HT6P237A Data sheet ( Hoja de datos )
| Número de pieza | HT6P237A | |
| Descripción | (HT6P237A / HT6P247A) Learning RF Encoder | |
| Fabricantes | Holtek Semiconductor | |
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HT6P237A/HT6P247A
Learning RF Encoder
Features
• Operating voltage: 2.0V ~3.6V
• Average Operating Current:
♦♦ 20mA @ VDD=3.0V, 12dBm;
♦♦ 30mA @ VDD=3.0V, 16dBm
• Standby current: 1.0μA (Max.) @ VDD=3V
• HT6P237A codes are fully compatible with
HT6P20B
• Up to 4 data pins
• Providing 2 compound data trigger pins
• Up to 224 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
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.
Rev. 1.00
1 April 12, 2013
Free Datasheet http://www.datasheet4u.com/
1 page  
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.
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.)
DOUT
Pilot Address/Data/End
code code
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
DOUT
1 code word
Transmission Timing Diagram
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.
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.
Bit “0”
1λ
2λ
Bit “1”
t DW
1λ
2λ
Address/Data bit
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.
Symbol
Parameter
tDW
One bit data width
(tDW) @433.92MHz
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
Unit
ms
—
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
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet HT6P237A.PDF ] | |
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