MX844: 12-Bit, Multi-Channel Power & Temperature Sensor

• Wide Input Supply Range: 4.5V to 40V
• Programmable-Gain Differential Amplifier
• 4-Channel Differential Input Multiplexer (3 Input Channels plus Ground
• Integrated 12-Bit ADC
• Serial data output (SDO) with data ready pin
• Fine Calibration of Full-Scale Range (FSR) Using VTRIM Pin
• Bidirectional Current Sense
• Internal Temperature Sensor With 0.2°C Resolution
• Compatible with 3.3V and 5V Microcontrollers

MX844 (Data Sheet) is a fully integrated subsystem that measures temperature plus differential current and voltage. An internal temperature sensor measures ambient temperature with ±2.5°C accuracy. Current and voltage measurements are made differentially through a 4-input multiplexer connected to a programmable-gain, fully differential sense amplifier. The differential sense amplifier is optimized to measure very small positive or negative voltages near ground for low-side bidirectional sensing.

A dual-slope ADC converts the temperature sensor or sense amplifier outputs to a 12-bit digital word: 3-½ digits plus sign. The input multiplexer channel and programmable-gain amplifier range may be changed between ADC conversions. An on-chip voltage regulator enables the MX844 to operate over a wide input voltage range of 4.5V to 40V.

Controller interrupt or over-voltage/over-current signals may be generated by a pair of 12-bit digital comparators configured as a window comparator or as simple threshold detectors.

The serial port supports standard 4-wire synchronous serial data, or asynchronous serial “talk-only” data, and is compatible with most 3.3V and 5V microcontrollers.

• CMOS Technology
• TTL/CMOS Compatible Inputs
• Low Switching Noise
• 5ns Typical True/Complement Output Skew
• 5ns Typical Output Rise and Fall Times
• Up to 20V Output Voltage
• Output-High Voltage Programmable via VOPT
• Output-Low Voltage Programmable via VEE

MX856 and MX857 (Data Sheet) are high speed single channel level shifters with complementary output drivers. The MX856 features a 5.0V VCC positive supply, and the MX857 features a 3.3V VCC positive supply.

The input buffers accept digital TTL or CMOS level signals, amplify them to the VCC and GND supply rails, and generate complementary outputs. The translator level-shifts these output signals by amplifying them to the VCC and VEE supply rails.

The output drivers then buffer the signals to VOPT and VEE. VOPT may be set within the range of VCC and GND. The output drivers also adjust the complementary signals for minimized skew error.

• 3V to 60V Operating Range
• Integrated 10-Bit DAC
• 3-Wire Serial Interface
• Microcontroller Compatible
• Low Power
• Minimum External Components
• TSOT-23 RoHS Compliant Package

MX884 (Data Sheet) targets power management applications where high noise immunity and low cost are primary requirements. Its integrated 10-bit ADC provides high resolution, making it ideal for current monitoring systems. The MX884 enables digital power management, in which a microcontroller can readily monitor the current in a system and perform other control functions in power systems and motion control products.

The MX884 converts a small voltage developed across an external “current” sense resistor to a 10-bit digital output. It features a wide common mode input supply voltage range of 3V to 60V and easily interfaces to most microcontrollers. The design is simple yet cost-effective, requiring very few external components, making it especially suitable for high volume applications.