BU8307CF Rohm, BU8307CF Datasheet - Page 7

• Manufacturer Part Number: BU8307CF
• Description: Pulse / tone dialer for telephone set
• Manufacturer: Rohm

FCircuit operation
Keypad functions
P
R
H
0 to 9 These are numeric keys, and dial signals are
T
Communication ICs
A
, #
sent when one of these keys is pressed.
In tone mode, when these keys are pressed,
the corresponding DTMF signals are sent. In
pulse mode, if the # is the first key to be
pressed after going off-hook, the redial opera-
tion is executed. The
from pulse mode to tone mode.
When this key is pressed, a 3.6-second pause
is generated. It also serves as a “break pause”
key when redialing.
This is used to switch from pulse mode to tone
mode. It also serves as a “break pause” key
when redialing.
This is used in both redial and inhibit redial op-
erations. When redialing, it also serves as a
“break pause” key.
Pressing this key initiates on-hook operation.
key switches the unit
BU8307CS / BU8307CF
169