Datasheet

MPR121
Sensors
Freescale Semiconductor, Inc. 9
4.3 DC Characteristics
This section includes information about power supply requirements and I/O pin characteristics.
4.4 AC Characteristics
Table 5. DC Characteristics
(Typical Operating Circuit, V
DD
and V
REG
= 1.8V, T
A
= 25°C, unless otherwise noted.)
Parameter Symbol Conditions Min Typ Max Units
High Supply Voltage
V
DD
2.0 3.3 3.6 V
Low Supply Voltage
V
REG
1.71 1.8 2.75 V
Average Supply Current
(1)
1.: ECR set to 0x2C and all 12 channels plus one proximity channel activated. Measurement current CDC is set at maximum of 0x3F.
I
DD
Run Mode @ 1 ms sample period 393 μA
Run Mode @ 2 ms sample period 199 μA
Run Mode @ 4 ms sample period 102 μA
Run Mode @ 8 ms sample period 54 μA
Run Mode @ 16 ms sample period 29 μA
Run Mode @ 32 ms sample period 17 μA
Run Mode @ 64 ms sample period 11 μA
Run Mode @ 128 ms sample period 8 μA
Measurement Supply Current
I
DD
Peak of measurement duty cycle 1 mA
Idle Supply Current
I
DD
Stop Mode 3 μA
Input Leakage Current ELE_
I
IH
, I
IL
0.025 μA
Input Self-Capacitance on ELE_ 15 pF
Input High Voltage SDA, SCL
V
IH
0.7 x V
DD
V
Input Low Voltage SDA, SCL
V
IL
0.3 x V
DD
V
Input Leakage Current
SDA, SCL
I
IH
, I
IL
0.025 1 μA
Input Capacitance
SDA, SCL
7pF
Output Low Voltage
SDA, IRQ
V
OL
I
OL
= 6mA
0.5V V
Output High Voltage
ELE4 - ELE11 (GPIO mode)
V
OHGPIO
V
DD
= 2.7V to 3.6V: I
OHGPIO
= -10 mA
V
DD
= 2.3V to 2.7V: I
OHGPIO
= -6 mA
V
DD
= 1.8V to 2.3V: I
OHGPIO
= -3 mA
V
DD
- 0.5
V
Output Low Voltage
ELE4 - ELE11 (GPIO mode)
V
OLGPIO
I
OLGPIOD
= 1 mA
0.5 V
Power On Reset
V
TLH
V
DD
rising
1.08 1.35 1.62 V
V
THL
V
DD
falling
0.88 1.15 1.42 V
Table 6. AC Characteristics
(Typical Operating Circuit, V
DD
and V
REG
= 1.8V, T
A
= 25°C, unless otherwise noted.)
Parameter Symbol Conditions Min Typ Max Units
8 MHz Internal Oscillator
f
H
7.44 8 8.56 MHz
1 kHz Internal Oscillator
f
L
0.65 1 1.35 kHz