S i M 3 L 1 x x
Rev 1.1
47
4.6.6. Low Power Mode Advanced Capture Counter (ACCTR0)
The SiM3L1xx devices contain a low-power Advanced Capture Counter module that runs from the RTC0 clock
domain and can be used with digital inputs, switch topology circuits (reed switches), or with LC resonant circuits.
For switch topology circuits, the module charges one or two external lines by pulsing internal pull-up resistors and
detecting whether the reed switch is open or closed. For LC resonant circuits, the inputs are periodically energized
to produce a dampened sine wave and configurable discriminator circuits detect the resulting decay time-constant.
The advanced capture counter has the following general features:
Single or differential inputs supporting single, dual, and quadrature modes of operation.
Variety of interrupt and PM8 wake up sources.
Provides feedback of the direction history, current and previous states, and condition flags.
The advanced capture counter has the following features for switch circuit topologies:
Ultra low power input comparators.
Supports a wide range of pull-up resistor values with a self-calibration engine.
Asymmetrical integrators for low-pass filtering and switch debounce.
Two 24-bit counters and two 24-bit digital threshold comparators.
Supports switch flutter detection.
For LC resonant circuit topologies, the advanced capture counter includes:
Separate minimum and maximum count registers and polarity, pulse, and toggle controls.
Zone-based programmable timing.
Two input comparators with support for a positive side input bias at VIO divided by 2.
Supports a configurable excitation pulse width based on a 40
MHz oscillator and timer or an external digital
stop signal.
Two 8-bit peak counters that saturate at full scale for detecting the number of LC resonant peaks.
Two discriminators with programmable thresholds.
Supports a sample and hold mode for Wheatstone bridges.
lists the supported inputs and outputs for each of the packages.
Table
4.2.
SiM3L1xx Supported Advanced Capture Counter Inputs and Outputs
Input/Output
SiM3L1x7
SiM3L1x6
SiM3L1x4
ACCTR0_IN0
ACCTR0_IN1
ACCTR0_LCIN0
ACCTR0_LCIN1
ACCTR0_STOP0
ACCTR0_STOP1
ACCTR0_LCPUL0
ACCTR0_LCPUL1
ACCTR0_LCBIAS0
ACCTR0_LCBIAS1
ACCTR0_DBG0
ACCTR0_DBG1
Summary of Contents for SiM3L1xx
Page 2: ...2 Rev 1 1 ...
Page 62: ...SiM3L1xx 62 Rev 1 1 6 2 SiM3L1x6 Pin Definitions Figure 6 2 SiM3L1x6 GQ Pinout ...
Page 63: ...SiM3L1xx Rev 1 1 63 Figure 6 3 SiM3L1x6 GM Pinout ...
Page 69: ...SiM3L1xx Rev 1 1 69 6 3 SiM3L1x4 Pin Definitions Figure 6 4 SiM3L1x4 GM Pinout ...
Page 74: ...SiM3L1xx 74 Rev 1 1 6 4 TQFP 80 Package Specifications Figure 6 5 TQFP 80 Package Drawing ...
Page 81: ...SiM3L1xx Rev 1 1 81 6 6 TQFP 64 Package Specifications Figure 6 9 TQFP 64 Package Drawing ...
Page 89: ...SiM3L1xx Rev 1 1 89 Figure 7 3 SiM3L1x4 GM Revision Information ...