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Introduction
12.1 Introduction
The touchscreen controller and analog-to-digital converter subsystem (TSC_ADC_SS) is an 8-channel
general-purpose analog-to-digital converter (ADC) with optional support for interleaving touchscreen (TS)
conversions for a 4-wire, 5-wire, or 8-wire resistive panel. The TSC_ADC_SS can be configured for use in
one of the following applications:
• 8 general-purpose ADC channels
• 4-wire TSC with 4 general-purpose ADC channels
• 5-wire TSC with 3 general-purpose ADC channels
• 8-wire TSC
12.1.1 TSC_ADC Features
The main features of the TSC_ADC_SS include:
• Support for 4-wire, 5-wire, and 8-wire resistive TS panels
• Support for interleaving TS capture and general-purpose ADC modes
• Programmable FSM sequencer that supports 16 steps:
– Software register bit for start of conversion
– Optional start of conversion HW synchronized to Pen touch or external HW event (but not both)
– Single conversion (one-shot)
– Continuous conversions
– Sequence through all input channels based on a mask
– Programmable OpenDelay before sampling each channel
– Programmable sampling delay for each channel
– Programmable averaging of input samples - 16/8/4/2/1
– Differential or singled ended mode setting for each channel
– Store data in either of two FIFO groups
– Option to encode channel number with data
– Support for servicing FIFOs via DMA or CPU
– Programmable DMA Request event (for each FIFO)
– Dynamically enable or disable channel inputs during operation
– Stop bit to end conversion
• Support for the following interrupts and status, with masking:
– Interrupt for HW pen (touch) event
– Interrupt for HW Pen Up event
– Interrupt after a sequence of conversions (all non-masked channels)
– Interrupt for FIFO threshold levels
– Interrupt if sampled data is out of a programmable range
– Interrupt for FIFO overflow and underflow conditions
– Status bit to indicate if ADC is busy converting
12.1.2 Unsupported TSC_ADC_SS Features
This device supports all TSC_ADC_SS features.
1023
SPRUH73H–October 2011–Revised April 2013 Touchscreen Controller
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