HT12E HOLTEK, HT12E Datasheet - Page 5

• Manufacturer Part Number: HT12E
• Description: REMOTE CONTROL ENCODER IC
• Manufacturer: HOLTEK

Specifications of HT12E

• Termination Type: SMD
• Ic Generic Number: 12
• Operating Temperature Min: -20°C
• No. Of Bits: 12 Bit
• Package / Case: 18-DIP
• Operating Temperature Max: 75°C
• Rohs Compliant: Yes

HT12A/HT12E
Functional Description
Operation
12
The 2
series of encoders begin a 4-word transmission cycle upon receipt of a transmission enable (TE for the HT12E
or D8~D11 for the HT12A, active low). This cycle will repeat itself as long as the transmission enable (TE or D8~D11) is
held low. Once the transmission enable returns high the encoder output completes its final cycle and then stops as
shown below.
Transmission timing for the HT12E
Transmission timing for the HT12A (L/M=Floating or VDD)
Transmission timing for the HT12A (L/M=VSS)
Information Word
If L/M=1 the device is in the latch mode (for use with the latch type of data decoders). When the transmission enable is re-
moved during a transmission, the DOUT pin outputs a complete word and then stops. On the other hand, if L/M=0 the de-
vice is in the momentary mode (for use with the momentary type of data decoders). When the transmission enable is
removed during a transmission, the DOUT outputs a complete word and then adds 7 words all with the 1 data code.
An information word consists of 4 periods as illustrated below.
Composition of information
Rev. 1.20
5
February 20, 2009