MH88510/11
TIP
VDD
RING
RF
TF
VBAT
AGND
VEE
LED
SHK
IC
VDD
AGND
VBAT
MUTE
JUNCTOR
RRD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Preliminary Information
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
TIP
VDD
RING
RF
TF
VBAT
AGND
V
EE
LED
SHK
IC
V
DD
AGND
V
BAT
MUTE
JUNC
RRD
RGND
RRC
VRLY
Description
Tip Lead.
Connects to the “Tip” lead (A-wire) of the telephone line.
Positive Power Supply
Voltage. Normally +5V. This provides current for both internal
circuitry as well as the loop. Not internally connected to pin 12.
Ring Lead.
Connects to the “Ring” lead (B-wire) of the telephone line.
Ring Feed.
Connect to the Ring Relay contact. See Figure 5.
Leave open circuit
Battery Voltage Supply.
Normally -24V or -48V. Not internally connected to pin 14.
Analog Ground.
Supply and battery ground. Internally connected to pin 13. For
optimum performance connect pin 7 to pin 13.
Negative Power Supply Voltage.
Normally -5V.
LED Drive (Output).
Drives an LED directly. A logic low indicates an off-hook condition.
Switch Hook Detect (Output).
A logic low indicates an off-hook condition.
Internal Connection.
This pin is connected internally
Positive Power Supply
Voltage. Normally +5V. This provides current for both internal
circuitry as well as the loop.
Analog Ground.
Supply and battery ground. Internally connected to pin 13. For
optimum performance connect pin 13 to pin 7.
Battery Voltage Supply.
Normally -24V or -48V. Not internally connected to pin 6.
MUTE (Input).
A logic low will mute signals coming from Tip-Ring to the JUNC.
Receive/transmit audio speech path.
(Referenced to 0V GND).
Ring Relay Drive (Output).
Connects to the ring relay coil. A logic low activates the
relay.
Relay Ground.
Return path for relay supply votlage. Normally connected to AGND.
Ring Relay Control (Input).
A logic high activates the Ring Relay Drive (RRD) outputs.
Relay Positive Supply Voltage. Normally +5V. Connects to the relay coil and the relay
supply voltage. An internal clamp diode from VRLY to RGND is provided.
2-54
MITEL [ MITEL NETWORKS CORPORATION ]
