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利用内部ADC测量电池电压
Design Note DN101
Using the ADC to Measure Supply Voltage
By Kjetil Aamodt
Keywords
• ADC • CC2430
• VDD • CC2431
• Supply Voltage • CC2510
• CC1110 • CC2511
• CC1111
1 Introduction
The above mentioned SoCs contain a VDD/3 with 1.25 V as internal voltage
feature for sampling VDD/3 using the reference, VDD can easily be calculated.
ADC. By setting the ADC to sample
Figure 1: ADC Block Diagram
SWRA100A Page 1 of 4
Design Note DN101
Table of Contents
KEYWORDS 1
1 INTRODUCTION 1
2 VOLTAGE MEASUREMENT 3
3 GENERAL INFORMATION 4
3.1 DOCUMENT HISTORY 4
SWRA100A Page 2 of 4
Design Note DN101
2 Voltage Measurement
The following code sets up the ADC to perform voltage measurement of VDD/3.
/* Reference voltage: Internal 1.25 V,
Resolution: 12 bits,
ADC input: VDD/3 (VDD is the battery voltage) */
#define SAMPLE_BATTERY_VOLTAGE(v) \
do { \
ADCCON2 = 0x3F; \
ADCCON1 = 0x73; \
while (!(ADCCON1 0x80)); \
v = ADCL; \
v |= (((unsigned int)ADCH) 8); \
} while (0)
//
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