MPR121QR2 Freescale Semiconductor, MPR121QR2 Datasheet - Page 27
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MPR121QR2
Manufacturer Part Number
MPR121QR2
Description
IC CTLR TOUCH SENSOR 20-QFN
Manufacturer
Freescale Semiconductor
Type
Capacitive, Proximity Sensorr
Datasheet
1.MPR121QR2.pdf
(57 pages)
Specifications of MPR121QR2
Number Of Inputs/keys
12 Key
Data Interface
I²C, Serial
Voltage - Supply
1.71 V ~ 3.6 V
Current - Supply
29µA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-UQFN, 20-µQFN
Output Type
Logic
Interface
I²C
Input Type
Logic
Supply Voltage
2.5 V to 3.6 V
Dimensions
3 mm L x 3 mm W x 0.65 mm H
Temperature Range
- 40 C to + 85 C
Termination Style
SMD/SMT
Supply Current
29µA
Ic Interface Type
I2C
Supply Voltage Range
1.71V To 3.6V
Sensor Case Style
QFN
No. Of Pins
20
Operating Temperature Range
-40°C To +85°C
Interface Type
I2C
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MPR121QR2
MPR121QR2TR
MPR121QR2TR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MPR121QR2
Manufacturer:
FREESCALE
Quantity:
20 000
Sensors
Freescale Semiconductor
NOISE HALF DELTA (NHD)
NOISE COUNT LIMIT (NCL)
Table 24. Noise Count Limit Register Field Descriptions
Table 23. Noise Half Delta Register Field Descriptions
Field
NCL
7:0
Reset:
Reset:
Field
NHD
5:0
W
W
R
R
Noise Count Limit – The Noise Count Limit determines the number of samples consecutively greater
than the Max Half Delta necessary before it can be determined that it is non-noise.
00000000 Encoding 0 – Sets the Noise Count Limit to 1 (every time over Max Half Delta)
00000001 Encoding 1 – Sets the Noise Count Limit to 2 consecutive samples over Max Half Delta
~
11111111 Encoding 255 – Sets the Noise Count Limit to 255 consecutive samples over Max Half Delta
7
0
0
7
0
= Unimplemented
Noise Half Delta – The Noise Half Delta determines the incremental change when
non-noise drift is detected.
000000 DO NOT USE THIS CODE
000001 Encoding 1 – Sets the Noise Half Delta to 1
~
111111 Encoding 63 – Sets the Noise Half Delta to 63
= Unimplemented
6
0
0
6
0
Figure 26. Noise Count Limit Register
Figure 25. Noise Half Delta Register
5
0
5
0
4
0
4
0
NCL
Description
Description
3
0
3
0
NHD
2
0
2
0
1
0
1
0
0
0
0
0
MPR121
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