
MAX1441
Automotive, Two-Channel Proximity and
Touch Sensor
3
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 5V to 28V, VAA = VDD, TA = -40NC to +105NC. Typical values are at VBATT = 14V, fEX = 300kHz, TA = +25NC, unless oth-
erwise noted.) (Note 2)
Note 2: All units are production tested at TA = +25NC and TA = +105NC. Limits over the operating temperature range are guaran-
teed by design and characterization.
Note 3: Measured indirectly by testing the excitation signal frequency. The excitation signal frequency is determined by the master
oscillator frequency, which in turn determines the sample time.
Maximum Excitation Frequency
fEXMAX
Frequency Control register = 0x32 (Note 3)
500
kHz
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CAPACITIVE OFFSET DACS
Offset Adjustment Range
6 bits
63
pF
Offset Adjustment Resolution
1
pF
LOGIC INPUTS/OUTPUTS (P0._, RESET)
Output Logic Low
VOL
ISINK = 2mA
0.4
V
Output Logic High
VOH
ISOURCE = 2mA
VDD
- 0.5
V
Input Logic Low
VIL
3.0V < VDD < 3.6V
0.8
V
Input Logic High
VIH
3.0V < VDD < 3.6V
2.4
V
Leakage Current
IL
I/O = high impedance
0.01
1
F
A
Port 0 Interrupt Minimum Pulse
Width
3.0V < VDD < 3.6V
20
ns
HIGH-VOLTAGE OPEN-DRAIN OUTPUTS (OUT1, OUT2)
Output Logic Low
VOL2
ISINK = 2mA
0.5
V
Leakage Current
IL
VOUT1 = VOUT2 = 25V
1
F
A
MICROCONTROLLER
Flash Program Memory Size
16 bits wide
2k
Words
Program Memory Clear Time
tCPM
38
ms
Page Write Time
tW
10
ms
Maximum Flash Erase/Write
Cycles
nCYC
100k
Cycles
SRAM Size
128
Bytes
CPU Clock Frequency
fCPU
1.25
MHz
INTERNAL OSCILLATOR
Oscillator Frequency
Master oscillator
19.8
20.48
21.2
MHz
RC oscillator
31.7
32
32.2
kHz
VOLTAGE REGULATOR
Input Voltage
VBATT
5
14
28
V
Maximum Dropout Voltage
VDROP
IAA = 10mA
0.6
V
Quiescent Current
IQ
8
F
A
Output Voltage
VAA
5V < VBATT < 28V, 0 < IAA < 10mA
3.2
3.4
3.6
V