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PDF HT6P245A Data sheet ( Hoja de datos )
| Número de pieza | HT6P245A | |
| Descripción | (HT6P235A / HT6P245A) Learning RF Encoder without Crystal | |
| Fabricantes | Holtek Semiconductor | |
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HT6P235A/HT6P245A
Learning RF Encoder without Crystal
Features
• Operating voltage: 2.5V~3.6V
• Average operating current
♦♦ 20mA @ VDD=3.0V, 12dBm
♦♦ 30mA @ VDD=3.0V, 16dBm
• Standby current: 1.0μA (Max.) @ VDD=3V
• Up to 4 data pins
• 2 compound data trigger pins
• Up to 224 address codes
• Integrated 13.56MHz RC oscillator
• 8 bit time using 2 pin selection
• Integrated UHF transmitter
• Frequency: 433MHz
• Supports ASK/OOK modulation
• 3 output power levels: 12dBm/14dBm/16dBm
using a single pin selection
• Minimal external components
• High noise immunity
• 16-Pin NSOP package
Applications
• Burglar alarm systems
• Smoke and fire alarm systems
• Personal alarm systems
• Car/garage door controllers
• Home/office/car security systems
• Other remote control systems
General Description
The devices are a series of encoders which include
a fully integrated 433MHz ASK transmitter for
remote control system applications. They form a
highly functionally integrated device series which
can be described as true “switch-in, antenna-out”
monolithic devices. The devices encode 24 or 28
bits of address and data information and then serially
transmits it via their DOUT pin upon receipt of a
transmission enable signal which is provided by data
pins, D0~D3 or B0~B1. The devices also encode the
address and data information into a coded waveform
which is transmitted out on their PAOUT pin for RF
modulation. Two areas stand out for special attention,
those of power delivery and operating temperature.
In terms of power, the HT6P2x5A is capable of
delivering +16dBm into a 50Ω load, a power level
which enables a small form factor transmitter, such as
a key fob transmitter, to operate over a long distance.
In terms of temperature, the HT6P2x5A can operate
from -10˚C to 50˚C with very little frequency drift.
Additionally the devices are extremely easy to use
and having a fully integrated oscillator require only
a minimum of external components to implement a
complete and versatile transmitter. For longer distance
remote control, the devices operate together with an
ASK/OOK – Amplitude Shift Keying/On-Off Keyed
– UHF wide-band super-regenerative receiver.
Selection Table
Part No.
VDD Addr. No.
HT6P235A 2.5V~3.6V
HT6P245A 2.5V~3.6V
22
24
Data No.
2
4
Compound
Data No.
1
2
Trig.
Frequency
Band
Data Low 433MHz
Data Low 433MHz
RF Type
ASK TX
ASK TX
Package
16 NSOP
16 NSOP
Rev. 1.00
1 June 07, 2013
Free Datasheet http://www.datasheet4u.com/
1 page  
HT6P235A/HT6P245A
Functional Description
The HT6P2x5A encodes the address code and data set
into a special waveform and output it to the DOUT. This
waveform is fed to the RF modulator for transmission.
Normal Operation
The HT6P2x5A series encodes and transmits
address/data to a decoder upon receipt of a trigger
signal. The transmission function of the HT6P2x5A
series are enabled by the data inputs, D0~D3 with the
– B0~B1 pins using active low conditions.
D0~D3, B0
1ms
(typ.)
DOUT
Pilot
code Address/Data/End
code
The transmission sequence is Pilot, Address, Data,
End code.
D0~D3, B0
< 1 pilot code
1pilot code < Active
< 1 code word
> 1 code word
DOUT
1 code word
Transmission Timing Diagram
1.1 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.
1.2 Address/Data bit waveform
An address/data bit can be designated as either bit ”0”
or “1” if it is in a high or low state respectively. A
single bit waveform consists of three pulse cycles, as
shown the diagram.
Bit “0”
1λ
2λ
Bit “1”
t DW
1λ
2λ
Address/Data bit
Note: 1. Bit “0” consists of a “low” pulse for 1λ then
changes to a “high” pulse for 2λ.
2. Bit “1” consists of a “low” pulse for 2λ then
changes to a “high” pulse for 1λ.
1.3 Single-Bit Data Width
There are 8 different single-bit data widths as shown
in the table, selected using the BTS1 and BTS0
control pins.
Symbol
Parameter
Pin Condition
0/0
0/Floating
Group1 Group2
1.1 0.7
1.2 0.8
Unit
0/1 1.3 0.9
Floating/0
tDW
Single bit data width
BTS1/BTS0
Floating/ Floating
Floating/1
1.4 1.0
1.5 2.0 ms
1.6 2.1
1/0 1.76 2.2
1/ Floating
1.9 2.3
1/1
NC NC
—
Note: 1. Group2 is only available for HT6P235A.
2. The BTS0 and BTS1 pins can be set to either “1”, “0” or “ Floating”.
3. The BTS0 and BTS1 pins must not both be “1”, this can result in erroneous operation.
4. If an overlapping bit time situation exists then choose the nearest time bit value. For example if the
desired bit time is 1.46ms, then a choice of 1.5ms is preferred.
Rev. 1.00
5 June 07, 2013
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet HT6P245A.PDF ] | |
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