CCS803 datasheet(4/7 Pages) AMSCO

4 / 7 page

CC-000017-DS revision: 11

Datasheet for CCS803

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Website: www.ccmoss.com

Telephone: +44 1223 395 551

Date Issued: 26 May 2016

The recommended application circuit for CCS803 is shown below.

CCS803

Ethanol

Sensor

MCU

(With integrated ADC)

ADC Input

PWM

VDD

NX2301

GND

Pin2: Heater+

Pin1: Sensor+

Pins: 3 & 4

PWM

VDD

10KΩ

Optional depends

on ADC input

impedance

VREF_Enable

RL = 1KΩ

VREF

NX2301

10KΩ

VREF_Enable

Notes:

1. The sensor can be operated in pulsed mode to reduce overall power consumption. In this case the

Heater VH is only driven for a fraction of the time at regular intervals under the control of the MCU.

2. An equivalent VH can be produced more efficiently with a PWM than with a linear regulator if a PWM

output from the MCU is available to drive an external MOSFET switch (p-channel). If not driven the

MOSFET input should be pulled high.

3. The PWM must operate with a minimum frequency of 10 kHz. The following table illustrates PWM

duty cycle requirements to enable VH in the range 1.4 – 1.6V for CCS803, other duty cycles can be

calculated using the equation VH2 / VDD2 :

Target Heater

Voltage (VH)

Supply Voltage (V)

1.5V

1.8V

2.5V

3.3V

1.40

87%

60%

31%

22%

18%

1.50

100%

69%

36%

25%

21%

1.60

79%

50%

28%

24%

Recommended Application Circuit

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