HT6221A HOLTEK [Holtek Semiconductor Inc], HT6221A Datasheet - Page 9

• Manufacturer Part Number: HT6221A
• Description: Multi-Purpose Encoders
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

DOUT and IR LED
After the transmission codes are sent, the DOUT pin
generates transmission codes with a carrier, and the
IR-LED goes low to drive a transmission indicator. The
DOUT pin abbreviate exterior transistor, to provide large
current driving ability.
Application Circuits
HT6220A Application Circuit
Rev. 1.10
Note: Km can be one of K22~K24
Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)
Timing 6. Valid Double-Key Input
HT6220A/HT6221A/HT6221B/HT6222A
9
IRC
The frequency of the internal RC(IRC) oscillator is de-
pending on the temperature and operating voltage.
At Ta=25 C at 3.0V, the IRC has an accuracy of 1 per
cent. In the range of 0 C to 70 C at 2.0V~3.6V, the accu-
racy value of the RC frequency increases to the maxi-
mum value of 2 per cent.
June 1, 2010