Baseband AD Converter Channels usage in N and D

The auxiliary A/D converter channels inside RFI2, N450 are used by MCU to measure battery voltage. The A/D converters are accessed by the DSP, D152 via the ASIC, D151. The required resolution is 10 bit.

The MCU has 4 10 bit A/D channels which are used for baseband voltage monitoring. The MCU can measure charger voltage, battery size, battery temperature and accessory detection by using it's own converters.

Technical Documentation System Module

Baseband N450 A/D Converter Channel Usage

Name: Usage: Input volt. range Remark

Chan 0 Battery voltage

Chan 0 Battery voltage

Chan

1

Charger voltage

5.

.16 V

Chan

2

Battery size indic.

Q.

.3.2 V

Chan

3

Battery temperature

Q.

.3.2 V

Chan

4

System board temp.

Q.

.3.2 V

Chan

5

Accessory detection

Q.

.3.2 V

Chan

6

Q.

.3.2 V

Chan

7

Battery voltage

5.

.9 V

MCU Baseband

A/D

Converter Channel Usage

Name: Usage:

Name: Usage:

Battery voltage when TX is active

Not used Not used

Battery volt. TX inactive

Input volt. range Remark

Chan 0 Battery temperature 0...3.2 V

Chan 1 Charger voltage 5...16 V

Chan 2 Accessory detection 0...3.2 V

Chan 3 Battery size indicator 0...3.2 V

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