HT9020B View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT9020B' PDF : 7 Pages View PDF
Block Diagram
HT9020
Pin Assignment
Pin Description
Pin Name
I/O
Internal
Connection
Description
DEC/ABRC I
CMOS IN
When this pin is connected to VDD, the chip is in the call
progress tone decoder mode (CPTD mode)
When this pin is connected to VSS, the chip is in the auto busy
redial controller mode (ABRC mode)
OE/HKOFF I
CMOS IN
CPTD mode: DIAL, RBK, BUSY and ENV pin tristate output
control pin. OE=VDD: Tristate output selected
ABRC mode: Off hook sense pin
HKOFF=VDD: Reset controller and disable ABR operation
2
21st Aug ’98
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