Analog-to-Digital Converter (ADC)
PXN20 Microcontroller Reference Manual, Rev. 1
34-2 Freescale Semiconductor
34.1.2 Features
The ADC digital interface provides the following features:
• 10-bit resolution
• As many as 64 internal channels
— 16 high precision
— 48 normal precision
• As many as 32 additional external channels supported
• Three different sampling and conversion time registers, one for each group of input channels
• Conversions on external channels have all the same features as the internal ones
• External decode signals (3 bits) for external analog mux
• Conversion speeds as short as 1 µs (1 MHz)
• Supports current injection ±1 ma
• One-shot/scan modes
• Chain injection mode
• Triggered injection
•Presampling
• Offset cancellation and offset refresh control
• External start feature
• Power down mode
• Two different abort features allow aborting either a single-channel conversion or chain conversion
• As many as 96 data registers for storing the converted data. Some conversion information as mode
of operation (normal, injected, or CTU) is associated with data value.
• Configurable analog watchdog channels controlled by the generic parameter num_watchdog
• Alternate analog thresholds
• Auto clock off feature
• Clock prescaler (ipg_clk divided by 2)
• CTU trigger mode
• Big Endian
34.2 External Signals
The ADC supports two types of external signals: power signals and analog input signals. See Chapter 3,
Signal Description. Table 3-1 describes the analog input signals and Table 3-2 describes the power signals.
NOTE
In Chapter 3, Signal Description, AN[0:63] = internal channels.
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