Temperature and Humidity sensor
MMS201AA Data Sheet
2021 7/29
Rev1.1
The contents of this document are subject to change without notice.
©2020 Mitsumi co., Ltd. All rights reserved. MITSUMI ELECTRIC CO., LTD. Semiconductor Div.
https://www.mitsumi.co.jp/latest/Catalog/index/index_e.html
1
Description
The MMS201 is a combined relative humidity and temperature sensor module.
The dual sensor is also combined with our custom analog front end to provide a
fully calibrated and temperature compensated digitized I
2
C output. The MMS201
proprietary polymer and parallel plate capacitive structure provides excellent
robustness and reliability. No complicated sensor drive or control circuit is required,
and high performance sensing is achievable only with the MMS201 and an external
microcontroller which works as a host.
Features
Small module: 24mm(W) × 16mm(D)
Operating temperature ranges -25~+85℃
Operating Humidity ranges 0~100%RH
Supply voltage 2.2~5.5V
Current consumption 8.97µA Typ. （@1sample/sec.）
Current consumption at sleep 0.85µA Typ.
Output corrected humidity value with repeatability of 0.015%RH (I
2
C)
Equipped with a heater for checking operation
8-bit I
2
C address 50h(Write), 51h(Read)
Temperature and Humidity sensor
MMS201AA
The contents of this document are subject to change without notice.
©2020 Mitsumi co., Ltd. All rights reserved. MITSUMI ELECTRIC CO., LTD. Semiconductor Div.
https://www.mitsumi.co.jp/latest/Catalog/index/index_e.html
2
Contents
Description .......................................................................................................................................................... 1
Features ............................................................................................................................................................. 1
BLOCK DIAGRAM ................................................................................................................................................. 3
Internal structure ................................................................................................................................................ 4
PIN CONFIGURATION .......................................................................................................................................... 4
TERMINAL EXPLANATIONS .................................................................................................................................. 5
ABSOLUTE MAXIMUM RATINGS ........................................................................................................................... 6
RECOMMENDED OPERATING CONDITIONS .......................................................................................................... 6
Power-on sequence ......................................................................................................................................... 7
Reapply voltage sequence ................................................................................................................................ 7
ELECTRICAL CHARACTERISTICS .......................................................................................................................... 8
Analog characteristics ...................................................................................................................................... 8
Humidity sensor characteristics ........................................................................................................................ 9
Temperature sensor characteristics .................................................................................................................. 9
Digital I/O ..................................................................................................................................................... 10
DEFINITION OF CHARACTERISTICS ................................................................................................................... 11
FUNCTION ........................................................................................................................................................ 12
Description of operation method..................................................................................................................... 12
Description of state （Sleep State / Measurement State） ................................................................................... 12
About system design ..................................................................................................................................... 12
Detailed description of Measurement state ...................................................................................................... 13
Heater function ............................................................................................................................................. 15
State transition table ..................................................................................................................................... 16
State transition diagram ................................................................................................................................. 17
Control register ............................................................................................................................................. 18
Status register ............................................................................................................................................... 19
Method of calculation to temperature and humidity values ............................................................................... 20
SERIAL INTERFACE ........................................................................................................................................... 21
I
2
C format ..................................................................................................................................................... 21
Write format ................................................................................................................................................. 21
Read format .................................................................................................................................................. 22
Combined format ........................................................................................................................................... 23
I
2
C AC characteristics ..................................................................................................................................... 24
TYPICAL APPLICATION CIRCUIT ........................................................................................................................ 25
TYPICAL PERFORMANCE CHARACTERISTICS ...................................................................................................... 26
DIMENSIONS .................................................................................................................................................... 29