MT9092
Pin Description (continued)
Pin
Name
#
Description
14
15
16
DATA 2 Serial Data Transmit. In an alternate mode of operation, this pin is used for data transmit
from MT9092. In the default mode, serial data transmit and receive are performed on the
DATA 1 pin and DATA 2 is tri-stated.
DATA 1 Bidirectional Serial Data. Port for microprocessor serial data transfer compatible with MCS-
51 standard (default mode). In an alternate mode of operation , this pin becomes the data
receive pin only and data transmit is performed on the DATA 2 pin. Input level TTL compatible.
CS
Chip Select (Input). This input signal is used to select the device for microport data
transfers. Active low. (TTL level compatible.)
17
18
WD
IC
Watchdog (Output). Watchdog timer output. Active high.
Internal Connection. Tie externally to V for normal operation.
SS
19,
20
NC
No Connection. No internal connection to these pins.
21
V
SSD
Digital Ground. Nominally 0 volts.
22- S1-S12 Segment Drivers (Output). 12 independently controlled, two level, LCD segment drivers. An
33
in-phase signal, with respect to the BP pin, produces a non-energized LCD segment. An out-
of-phase signal, with respect to the BP pin, energizes its respective LCD segment.
34
35
BP
Backplane Drive (Output). A two-level output voltage for biasing an LCD backplane.
Positive Power Supply (Input). Nominally 5 volts.
V
DD
36 HSPKR- Inverting Handset Speaker (Output). Output to the handset speaker (balanced).
37 HSPKR Non-Inverting Handset Speaker (Output). Output to the handset speaker (balanced).
+
38
39
40
SPKR- Inverting Speaker (Output). Output to the speakerphone speaker (balanced).
SPKR+ Non-Inverting Speaker (Output). Output to the speakerphone speaker (balanced).
V
Power Supply Rail for Analog Output Drivers. Nominally 0 Volts.
SS
SPKR
41
42
MIC-
Inverting Handsfree Microphone (Input). Handsfree microphone amplifier inverting input
pin.
MIC+ Non-inverting Handsfree Microphone (Input). Handsfree microphone amplifier non-
inverting input pin.
43
44
V
Analog Ground. Nominally 0 V.
SSA
M-
Inverting Microphone (Input). Inverting input to microphone amplifier from the handset
microphone.
NOTES:
Intel and MCS-51 are registered trademarks of Intel Corporation, Santa Clara, CA, USA.
7-5
MITEL [ MITEL NETWORKS CORPORATION ]
