Enabler II-G Assiste GPS Integration Guide - Farnell

Enfora Enabler III-G
Modem Integration Guide
6.6.14. Keyboard (Pins 27, 29, 31, 32, 33, 34, 36, 38, 40, 42 )
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
Pin Name Pin Number Signal Direction Description
KBC0 27 O Keyboard matrix column 0 output
KBC1 33 O Keyboard matrix column 1 output
KBC2 29 O Keyboard matrix column 2 output
KBC3 31 O Keyboard matrix column 3 output
KBC4 32 O Keyboard matrix column 4 output
KBR0 38 I Keyboard matrix Row 0 input
KBR1 40 I Keyboard matrix Row 1 input
KBR2 42 I Keyboard matrix Row 2 input
KBR3 36 I Keyboard matrix Row 3 input
KBR4 34 I Keyboard matrix Row 4 input
For hardware reference only. There is no generic firmware to support this function.
Firmware must be added to enable Keyboard functions
Keyboard Parameter/Conditions Min Typ Max Units
VIH High level input voltage 1.17 1.8 1.9 V
VIL Low level input voltage 0.63 V
VOH High level output voltage, IO = 4 mA 1.35 1.8 V
VOL Low level output voltage, IO = 4 mA 0.45 V
II Input leakage current ±1 µA
Iout Output current 8 mA
PU PU resistance 18 kΩ
PD PD resistance 90 kΩ
Iz Leakage current ± 20 µA
GSM0308PB001 53 Version 1.03– 7/17/2007