MPR121QR2 Freescale Semiconductor, MPR121QR2 Datasheet - Page 25

• Manufacturer Part Number: MPR121QR2
• Description: IC CTLR TOUCH SENSOR 20-QFN
• Manufacturer: Freescale Semiconductor
• Type: Capacitive, Proximity Sensorr

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

Sensors
Freescale Semiconductor
response time of the output is the SFI times the ESI. This usually results in 16 ms and 4 iterations being used to get 64 ms
response time while still optimizing the power consumption. At each 64 ms, a decision would be made regarding touch by com-
paring the Baseline with the filtered data output, resulting in a a worst case of the full 64 ms plus half the previous cycle, equalling
96 ms.
The output data is the Filtered Data High and Low is the data coming out of the second stage filter. This means that the
400
300
200
100
10
1
393 μA
2
199 μA
Figure 23. Average Supply Current
4
102 μA
SAMPLE RATE (ms)
8
54 μA
16
29 μA
32
17 μA
64
11 μA
128
8 μA
MPR121
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