The MXB7846 is a 4-wire touch-screen controller that uses an internal reference and temperature sensor. It contains a 12-bit sampling analog-to-digital converter (ADC) with its synchronous serial interface and low on-resistance switches for driving resistive touch screens. The device has an on-chip temperature sensor, a battery-monitoring channel, and has the ability to perform touch-pressure measurements without external components. The device has one auxiliary ADC input. All analog inputs are fully ESD protected, eliminating the need for external TransZorb™ devices. The MXB7846 guarantees to operate with a supply voltage down to +2.375V when used with an external reference or +2.7V with an internal reference. In shut-down mode, the typical power consumption is reduced to under 0.5µW, while the typical power consumption at 125ksps throughput and a +2.7V supply is 650µW. Low-power operation makes the MXB7846 ideal for battery-operated systems, such as personal digital assistants.
The MXB7846 is a 4‑wire resistive touch‑screen controller that integrates a 12‑bit SAR ADC, an internal 2.5 V reference, on‑chip temperature sensor, and a battery‑monitoring channel. It operates from a single supply of +2.375 V to +5.25 V and is offered in 16‑pin QSOP and TSSOP packages.
Key features include ESD‑protected ADC inputs, low‑power shutdown mode (<0.5 µW), SPI/QSPI compatible serial interface, and programmable resolution. The device is suited for battery‑operated equipment such as PDAs, portable instruments, and point‑of‑sale terminals.
| Resolution | 12 bits |
|---|---|
| Shutdown power consumption | <0.5 µW |
| Operating temperature range | -40 °C to +85 °C |
Yes, it includes an internal 2.5 V reference.
Yes, it provides direct battery measurement from 0 to 6 V.
It is offered in 16‑pin QSOP and 16‑pin TSSOP packages.