Lcd_El_En; Keypad; General-Purpose A/D Converter - Gpadc; Table 14. Gpadc Specifications - Motorola c18 Developer's Manual

Cellular engine module description
Table of Contents

Advertisement

Hardware Description
3.9.3

LCD_EL_EN

The c18 provides support for controlling an electro-luminescent (EL) lamp. The output enables four levels of intensity control.
3.9.4

Keypad

The keypad interface consists of eight pins, which can be used to connect a matrix keypad and other control buttons (such as
volume up/down). Each pin asserts an interrupt if pulled low. All keypad lines have internal pull-ups.
3.9.5

General-purpose A/D Converter - GPADC

The c18 has two general-purpose ADC inputs, ADC1 and ADC2. The GPADC is located in the MSM5100 block. It is intended
to digitize DC signals corresponding to analog parameters, such as battery voltage and temperature.
Table 14 lists the GPADC specifications.
Parameter
Resolution
Full-scale error
Offset error
Channel isolation
Full-scale input range
3dB input bandwidth
Input serial resistance
Input capacitance
Vref can be software configured to 0.62 V, 1.24 V, 1.86 V or 2.5 V
*
This feature is hardware supported.
Note
36

Table 14. GPADC Specifications

Min
Typ
Max
8
+/-1
+/-6
50
GND
Vref
2.65
5
12
Units
Comments
Bits
LSB
LSB
dB
At DC
*
Source resistance = 50 Ω
MHz
KΩ
pF
.
98-08901C63-A

Advertisement

Table of Contents
loading

Table of Contents