Sensor Interface

Galvanostat sensor interface circuit

• Voltage is measured by applying current source
• Effective voltage range: 0.12 to 1.2V

Programmable current source

• 2 ranges
  • 8 - 504 µA @ 8µA/Step ± 4 µA
  • 1 - 63µA @ 1µA/Step ± 0.5 µA

Built-in ADC

• 10-Bit accuracy
• Selectable post processing average
• Adjustable conversion starting point to avoid uplink to ensure power stability.
• Configurable built-in voltage buffer for high impedance sensor
• 1.28V temperature compensate voltage reference
• Conversion rate from 8 ms to 205 ms

Adjustable voltage limiter for preventing sensor burning or overvoltage

• 1.28 V

Adjustable sensor biasing frequency for supporting wide capacitance-range sensor

• 300 Hz - 50 kHz

Adjustable sensor biasing frequency for supporting wide capacitance-range sensor

• 10 - 1,808 µs

Adjustable sensor biasing frequency for supporting wide capacitance-range sensor

• 8 - 491,528 clocks/ f,adc

Memory

• 236 bytes addressable EEPROM
• 192 bytes user memory EEPROM
• EEPROM organization enabling NDEF format
• EEPROM zone for initializing register – automatically reload after powerup
• Up to 100,000 erase/write cycles
• Up to 10 years memory retention at 70˚C

Operating Conditions

• Operating temperature: 0℃ to 55℃
• Storage temperature: -40℃ to 85℃

Package

• QFN 3x3 – 16 leads
• Au-bumped 12-inch die on wafer ring pad size: 80 µm x 80 µm

Applications

• Chemical sensor NFC tag
• Resistor/capacitor measurement
• Light/ humidity sensing NFC tag
• Temperature sensor
• Water TDS(Total dissolved solid)

DEVELOPMENT KIT SUPPORT MATERIAL

• Demo iOS/android application
• Reference PCB design and schematic diagram
• Reference antenna and antenna design tool

Download

• Datasheet
• Brochure