SIC4340

Galvanostat Sensor

236-Byte NFC Type 2 Tag IC with built-in ADC for galvanostat sensor interface
SIC4340 is a 236-byte NFC tag IC for resistive/capacitive sensor interface which can apply for chemical sensor, light sensor etc. The SIC4340 consists of an NFC Analog-Front-End circuit supporting ISO14443A, a selectable 5-to-10 bit resolution sigma-delta ADC, an on-chip regulator, a sensor interface circuit,a temperature compensate voltage reference, a control register page and an EEPROM. The SIC4340 is designed to get sensor’s voltage response at specific time after biasing. The sensor can be resistive, capacitive or combination of them.

DEVELOPMENT KIT SUPPORT MATERIAL

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

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℃