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Product Detailed Parameters
- Description：ADC TOUCH SCREEN CONTROLLER
- Series：-
- Mfr：Texas Instruments
- Package：Bulk
- Touchscreen：4 Wire Capacitive
- Resolution (Bits)：12 b
- Interface：Microwire, QSPI, SPI
- Voltage Reference：External, Internal
- Voltage - Supply：2.2V ~ 5.25V
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：16-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：16-TSSOP
- Current - Supply：780 µA
- Grade：-
- Qualification：-
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Overview
The ADS7846AE is a 12-bit successive approximation register (SAR) analog-to-digital converter designed for resistive touch screen controller applications. It operates on a single supply voltage ranging from 2.2V to 5.25V and features an internal 2.5V reference. The device supports direct battery measurement up to 6V, on-chip temperature sensing, and touch-pressure detection. It utilizes a QSPI/SPI 3-wire serial interface with a throughput rate of 125 kHz. The component is specified for operation over the –40°C to +85°C temperature range.
Feature Summary
- 12-bit resolution with no missing codes down to 11 bits
- Internal 2.5V reference with power-down capability
- Direct battery monitoring input (0.5V to 6V)
- On-chip temperature sensor with differential or absolute measurement modes
Applications
- Personal digital assistants
- Portable instruments
- Point-of-sale terminals
- Cellular phones
Procurement Notes
Verify the specific package option for the 'AE' suffix against the manufacturer's Package Option Addendum, as standard datasheets list E, N, I, and G variants. Confirm current production status and availability through authorized distributors, as discontinuation notices may apply to legacy components.
Selection Notes
Select this component for systems requiring low-power consumption in battery-operated environments. Ensure the host microcontroller supports the required 3-wire SPI/QSPI timing. Verify that the external clock frequency does not exceed the maximum sampling rate constraints defined by the supply voltage.
Part Context
The ADS7846 is a next-generation upgrade to the industry-standard ADS7843. It maintains 100% pin compatibility with the ADS7843, allowing for easy socket replacement in existing designs while adding features like battery monitoring and temperature sensing.
Replacement Considerations
The ADS7846E and ADS7846N are pin-compatible alternatives within the same family. Verify if the specific 'AE' suffix denotes a unique package or qualification level compared to standard commercial grades.
