CYG2911
Electrical Characteristics (Continued)
Parameter
Conditions
Min
Typ
Max
Unit
911 Detection Characteristics (Pin 7)
Pulse Voltage
External phone off-hook
External phone on-hook
-
-
2.4
-
-
-
V
V
V
CC
0.8
60
-
Pulse Width
Telephone DCR 200Ω
20
-
40
mS
Internal pull-up resistor
-
200K
Ω
Package Pinout
CYG2911 Pinouts & Definitions
PIN# I/O Name Function
CYG2911
VCC
GND
LINE 1
LINE 2
1
2
18
17
1
2
7
I/O LINE1 Transformer isolated audio signal coupling path for the
telephone line.
CID1
CID2
14
13
I/O LINE2 Transformer isolated audio signal coupling path for the
telephone line.
911
OH
RING
7
8
9
TIP
RING
11
10
O
911 Signals HIGH for 20-60ms when the CYG2911 is off-hook
and another phone goes off-hook. Glitches may appear on
this pin when the CYG2911 first goes off-hook, and should
be ignored for a minimum of 200ms.
Top View
8
9
I
OH Driving this pin LOW asserts the off-hook condition. The
hookswitch LED is current limited by an internal 470Ω
resistor.
O
RING Active LOW indicates an incoming ring signal. This is
pulsed LOW by the AC ring signal at the ring frequency
from 15-40Hz.
10 I/O RING Connection to telephone line Ring conductor.
11 I/O TIP Connection to telephone line Tip conductor.
13
O
CID2 Caller ID connection. CID1/CID2 connect to an external 1-
Form-A solid state relay (Clare LCA110). When the SSR is
closed (connecting CID1 to CID2), Caller ID information is
presented to LINE1/LINE2 after the first telephone ring
burst.
14
17
18
O
I
CID1 Caller ID connection. See CID2 above.
GND Connected to host system ground.
I
VCC Provides power to the hookswitch LED. Typically +5V for ≈
8mA LED current. LED is current limited by an internal
470Ω resistor. VCC should not exceed 20V.
CYG2911
Caller ID Connections
Pins 13 & 14 should be connected to a 1-Form-A
relay (Clare LCA110), as follows:
VCC
1
2
14
13
CID1
CID2
µP Control
(Active Low)
R1
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