u3760mb-n ATMEL Corporation, u3760mb-n Datasheet - Page 7

• Manufacturer Part Number: u3760mb-n
• Description: Low-voltage Standard Telephone Circuit
• Manufacturer: ATMEL Corporation

Rev. A1, 31-May-99
SSO44
31
32
33
34
36
37
38
39
Symbol
VDD 1
VDD 2
MODE
RCK
OUT
HKS
BM
DP
RC clock oscillator for ringer
Buzzer output
Supply output for dialer part
Supply input of dialer section
Hook switch input.
HKS = 1: On-hook state. Chip in sleep mode,
no operation.
HKS = 0: Off-hook state. Chip enable for nor-
mal operation.
If BM = floating pulse dialing with 3:2 B/M
ratio
If BM is connected to ground pulse dialing
with a B/M ratio of 2:1
Pulling mode pin to V
tone mode. Pulling mode pin to GND places
the dialer in pulse mode ( 20 ppS ). If the
mode pin is left floating, the dialer is in pulse
mode ( 10 ppS)
N-channel open drain pulse dialing output.
Flash key will cause DP to be active in either
DTMF mode or pulse mode.
Preliminary Information
Function
DD
places the dialer in
VRING
MODE
VDD1
OUT
RCK
HKS
B/M
DP
VDD2
U3760MB-N
PD
PD
PD
Configuration
PD
6V
50V
30V
6V
6V
Ê Ê
PD
PD
6.5K
3.4V
6V
Ê Ê
PD
Ê
DP
0.8V
Ê
Ê
7 (20)
200
VL