Keyboard (Pins 27, 29, 31, 32, 33, 34, 36, 38, 40, 42 ) - Enfora Enabler III-G Integration Manual

Enfora Enabler III-G
Modem Integration Guide

6.6.15. Keyboard (Pins 27, 29, 31, 32, 33, 34, 36, 38, 40, 42 )

Pin Name
KBC0
KBC1
KBC2
KBC3
KBC4
KBR0
KBR1
KBR2
KBR3
KBR4
The module keyboard controller implements a built-in scanning algorithm for hardware-based key press
decoding and allows MPU software overhead reduction. The keyboard controller can handle up to 5 × 5
keyboards, operates on a 32 kHz clock, and can generate wake-up events when the device is in sleep
mode.
The keyboard controller includes the following main features:
•
Support of multi-configuration keyboards up to 5 rows x 5 columns
•
Integrated programmable timer
•
Event detection on both key press and key release
•
Multi-key press detection and decoding
•
Long key detection on prolonged key press
•
Programmable time-out on permanent key press or after keyboard release
F
or hardware reference only. There is no generic firmware to support this function.
Firmware must be added to enable Keyboard functions (TBD)
Keyboard Parameter/Conditions
VIH High level input voltage
VIL Low level input voltage
VOH High level output voltage, IO = 4 mA
VOL Low level output voltage, IO = 4 mA
II Input leakage current
Iout Output current
PU PU resistance
PD PD resistance
Iz Leakage current
GSM0308PB001
Pin Number Signal Direction
27
33
29
31
32
38
40
42
36
34
O Keyboard matrix column 0 output
O Keyboard matrix column 1 output
O Keyboard matrix column 2 output
O Keyboard matrix column 3 output
O Keyboard matrix column 4 output
I Keyboard matrix Row 0 input
I Keyboard matrix Row 1 input
I Keyboard matrix Row 2 input
I Keyboard matrix Row 3 input
I Keyboard matrix Row 4 input
Min
1.17
1.35
Version DRAFT – 2/9/2007
47
Description
Typ Max Units
1.8 1.9 V
0.63 V
1.8 V
0.45 V
±1 µA
8 mA
18 kΩ
90 kΩ
± 20 µA