Microchip Technology MTCH650 & MTCH652 Projected Capacitive Drivers
Microchip Technology MTCH650 and MTCH652 Projected Capacitive Drivers are line driver / level shifter devices, with the MTCH650 providing up to 21 level shifters and the MTCH652 providing up to 19 level shifters. The MTCH650 requires only a 3-wire serial interface, latch enable (LE), and 2 capacitors. The MTCH652 offers an integrated compact boost convertor, which provides an easy-to-use solution for driving High Voltage (HV) outputs. The MTCH652 requires only a 3-wire serial interface, latch enable (LE), 2 capacitors, a PWM, and a small inductor. The PWM is used to drive the boost and allows flexibility in duty cycle and frequency. The selectable internal Soft Start limits initial in-rush currents, preventing system brown outs.
The MTCH650 and MTCH652 both contain a Configuration register (CONFIG) and a data (DATA) register. The CONFIG register can be adjusted using the SPI interface, allowing for voltage changes during application time. The CONFIG register sets the output voltage, the current limit and the Soft Start settings. The DATA register configures the 19/21 bit output mask for the HV output latches. The Output Enable (OE) allows for efficient cycling of the boost voltage on the HV output latches without the delay of setting HV output latches via the serial interface. The HV output latches are set to "0" when Output Enable (OE) is "0". The HV output latches are set to the output mask when OE is "1".
While the MTCH650 and MTCH652 are very similar, the MTCH650 does not include a built-in boost circuit. The MTCH650 will require an external boost voltage device, such as the MCP16301.
The Microchip Technology MTCH650 and MTCH652 Projected Capacitive Drivers are available in SOIC28, SSOP28, and UQFN28 package options for design flexibility.
Features
- MTCH652
- 19 high voltage I/O lines
- Built-in boost
- Internal switch
- 8V to 5.5V input operating range
- Low <200µA quiescent current
- Low 5µA shutdown current
- Up to 50 mA output current, at VIN = 3.6V and VOUT = 12V
- Boost driven by an external PWM allowing for greater boost flexibility
- Selectable 6V, 8V, 10V, 12V, 14V, 16V, and 18V output voltage range
- Selectable current limiting
- Selectable soft start
- High-speed SPI interface
- 1MHz maximum
- Output Enable (OE) independent of SPI interface
- Built-in discharge circuit
- MTCH65
- 21 high voltage I/O lines
- 8V to 5.5V input operating range
- Low <200µA quiescent current
- Low 5µA shutdown current
- Up to 100mA Output Current with 5mA per OUTxx Channel
- Output Enable (OE) independent of SPI interface
- 6V to 18V External VPPIN Range
- Package options
- SOIC28
- SSOP28
- UQFN28
Applications
- Human-machine interfaces with configurable button, keypad, or scrolling functions
- Single finger gesture interfaces to swipe, scroll, or doubletap controls
- Home automation control panels
- Security control keypads
- Automotive center stack controls
- Gaming devices
- Remote control touch pads
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