U3761MB-T Datasheet, PDF (10/27 Pages) ATMEL Corporation – Universal Telephone IC - All Functions Integrated

Pin Description
Pin Symbol Function
Pulling MODE pin to:
C3: tone mode with 87 ms burst time and 140 ms pause
C4: tone mode with 87 ms DTMF burst and 87 ms pause
R1: pulse mode with 20 pps, Make/Break = 40/60
R2: pulse mode with 20 pps, Make/Break = 33/66
38
MODE R3: pulse mode with 10 pps, Make/Break = 40/60
R4: pulse mode with 10 pps, Make/Break = 33/66
C1: pulse mode with 10 pps, Make/Break = 33/66 and temp.
DTMF with 87 ms DTMF burst, 140 ms pause
MODE pin pulled to R4: with temporary DTMF, 87 ms DTMF
burst and 87 ms pause
MODE
Pulse dialing output. Flash key will cause DP to be active in
39
DP ^{either DTMF mode or pulse mode.}
DP
In on-hook state is DP = VDD
Configuration
VDD
VDD
PD
VDD
PD
Short mute during pulse dialing, active high
40
Mask During MASK an internal NPN transistor shortens VL
against VI.
41
R1
42
R2
43
R3
Keyboard input
44
R4
MASK
VDD
PD
R1
R2-R4
VDD
VDD
PD
VDD
VDD
PD
10 U3761MB-T
4744A–CORD–09/03