U3761MB-T Datasheet, PDF (9/27 Pages) ATMEL Corporation – Universal Telephone IC - All Functions Integrated

Pin Description
Pin Symbol Function
32
OUT Buzzer output
33
VDD Supply output for dialer part
U3761MB-T
Configuration
VRING
200
30 V
6.5K
PD
OUT
50 V
PD
VL
VDD
6V
6V
PD
34
Test Test input with 6.25 kW pull-up resistor
TEST
35
NC Not connected
Hook switch input
HKS = 0: On-hook state. Chip in sleep mode, no operation
36
HKS (external pull-down resistor recommended)
HKS
HKS = 1: Off-hook state. Chip enable for normal operation
I_HKS £ 0.5 mA
VDD
VDD
VDD
PD
VDD
PD
Keytone output signal which is sent out in pulse dialing
37
KT mode with a keytone frequency of 582 Hz.
KT sink/drive current is about 100 µA at V_DD = 2.5 V
VDD
KT
VDD
PD
9
4744A–CORD–09/03