SI1010 Datasheet, PDF (28/384 Pages) Silicon Laboratories – Ultra Low Power, 16/8 kB, 12/10-Bit ADC MCU with Integrated 240-960 MHz EZRadioPRO Transceiver

Si1010/1/2/3/4/5
1.6. SAR ADC with 16-Bit Auto-Averaging Accumulator and Autonomous Low
Power Burst Mode
Si1010/1/2/3/4/5 devices have a 300 ksps, 10-bit or 75 ksps 12-bit successive-approximation-register
(SAR) ADC with integrated track-and-hold and programmable window detector. ADC0 also has an autono-
mous low power Burst Mode which can automatically enable ADC0, capture and accumulate samples,
then place ADC0 in a low power shutdown mode without CPU intervention. It also has a 16-bit accumulator
that can automatically average the ADC results, providing an effective 11, 12, or 13 bit ADC result without
any additional CPU intervention.
The ADC can sample the voltage at any of the GPIO pins (with the exception of P2.7) and has an on-chip
attenuator that allows it to measure voltages up to twice the voltage reference. Additional ADC inputs
include an on-chip temperature sensor, the VDD/DC+ supply voltage, the VBAT supply voltage, and the
internal digital supply voltage.
ADC0CN
ADC0TK
ADC0PWR
Burst Mode Logic
VDD
From
AMUX0
AIN+
10/12-Bit
SAR
ADC
000
Start
Conversion
001
010
011
100
AD0BUSY (W)
Timer 0 Overflow
Timer 2 Overflow
Timer 3 Overflow
CNVSTR Input
16-Bit Accumulator
ADC0LTH ADC0LTL
A D 0 W IN T
Window
Compare
32
Logic
ADC0CF
ADC0GTH ADC0GTL
Figure 1.11. ADC0 Functional Block Diagram
28
Rev. 1.0