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CCS801B-COPR Datasheet(PDF) 4 Page - ams AG |
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CCS801B-COPR Datasheet(HTML) 4 Page - ams AG |
4 / 7 page CC-000015-DS revision: 11 Datasheet for CCS801 P a g e | 3 © Cambridge CMOS Sensors Ltd, Deanland House, Cowley Road, Cambridge, CB4 0DL, UK Website: www.ccmoss.com Telephone: +44 1223 395 551 Date Issued: 26 May 2016 The recommended application circuit for CCS801 is shown below. CCS801 IAQ 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 = 200KΩ 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 CCS801, other duty cycles can be calculated using the equation VH 2 / V DD 2 : Target Heater Voltage (VH) Supply Voltage (VDD) 1.5V 1.8V 2.5V 3V 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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