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MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(VDVDDIO = +5V, VAVDD = +3.3V; VDVDD = +2.5V, system clock (fSYSCLK) = 16MHz, burst frequency (fBURST) = bandpass frequency
(fBPF) = 50kHz, CREFBG = CREF = 1F in parallel with 0.01F, fADCCLK = 2MHz (SAR data rate = 125ksps), TA = TMIN to TMAX, unless
otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Adjustable Frequency Range
Using the RCTRM register
-40
+40
%
Frequency Adjustment
Resolution
0.2
%
SUPPLY VOLTAGE SUPERVISORS
DVDD Reset Threshold
Asserts
RESET if VDVDD falls below
this threshold
2.10
2.25
V
DVDD Interrupt Threshold
Generates an interrupt if VDVDD falls
below this threshold
2.25
2.38
V
Minimum Reset and Interrupt
Threshold Difference
150
mV
AVDD Interrupt Threshold
Generates an interrupt if VAVDD falls
below this threshold
2.95
3.15
V
DVDDIO Interrupt Threshold
Generates an interrupt if VDVDDIO falls
below this threshold
4.5
4.75
V
Supervisor Operating Range
At DVDD
1.5
2.75
V
Supervisor Hysteresis
1%
RESET Release Delay
After VDVDD rises above the reset
threshold
35
s
Power-Up Time
Time from
RESET is released to the
execution of the first instruction (serial
bootloader off)
1s
+5V LINEAR REGULATOR (DVDDIO, GATE5, Requires External Pass Transistor, see the Typical Application
Circuit/Functional Diagram)
Regulator Output Voltage
At DVDDIO
4.75
5.25
V
GATE5 Output High Voltage
ISOURCE = 0A (no load)
VDVDDIO
- 0.1
V
GATE5 Output Low Voltage
ISINK = 500A
2
V
GATE5 Output Resistance
ISINK = 0A to 50A
330
Gain Bandwidth
DVDDIO to GATE5
1.58
kHz
Gain
DVDDIO to GATE5
1700
V/V
GATE5 Slew Rate
4.3
V/ms
Maximum Load Capacitance
Maximum capacitance on DVDDIO
when using an external pass transistor
1F
+3.3V LINEAR REGULATOR (REG3P3)
REG3P3 Output Voltage
3.15
3.45
V
Load Current
50
mA
Output Short-Circuit Current
REG3P3 shorted to AGND
150
mA
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