Datasheet
MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
DVDDIO
= +5V, V
AVDD
= +3.3V; V
DVDD
= +2.5V, system clock (f
SYSCLK
) = 16MHz, burst frequency (f
BURST
) = bandpass frequency
(f
BPF
) = 50kHz, C
REFBG
= C
REF
= 1µF in parallel with 0.01µF, f
ADCCLK
= 2MHz (SAR data rate = 125ksps), T
A
= T
MIN
to T
MAX
, unless
otherwise specified. Typical values are at T
A
= +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 V
DVDD
falls below
this threshold
2.10 2.25 V
DVDD Interrupt Threshold
Generates an interrupt if V
DVDD
falls
below this threshold
2.25 2.38 V
Minimum Reset and Interrupt
Threshold Difference
150 mV
AVDD Interrupt Threshold
Generates an interrupt if V
AVDD
falls
below this threshold
2.95 3.15 V
DVDDIO Interrupt Threshold
Generates an interrupt if V
DVDDIO
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 V
DVDD
rises above the reset
threshold
35 µs
Power-Up Time
Time from RESET is released to the
execution of the first instruction (serial
bootloader off)
1µs
+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 I
SOURCE
= 0µA (no load)
V
DVDDIO
- 0.1
V
GATE5 Output Low Voltage I
SINK
= 500µA 2 V
GATE5 Output Resistance I
SINK
= 0µA to 50µA 330 Ω
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
1µF
+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