Datasheet

MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
_______________________________________________________________________________________ 7
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
DIGITAL OUTPUTS (GPIO, UART, JTAG, SPI)
I
SINK
= 0.5mA, drive strength = low 0.4
Output Low Voltage
I
SINK
= 1.0mA, drive strength = high 0.4
V
I
SOURCE
= 0.5mA,
drive strength = low
V
DVDDIO
-
0.5
Output High Voltage
I
SOURCE
= 1.0mA,
drive strength = high
V
DVDDIO
-
0.5
V
Drive strength = low 880
Maximum Output
Impedance
Drive strength = high 450

Three-State Leakage ±0.01 ±1 µA
Three-State Capacitance 15 pF
BURST OUTPUT
Output Low Voltage I
SINK
= 8mA 0.4 V
Output High Voltage I
SOURCE
= 8mA
V
DVDDIO
-
0.5
V
Drive strength = low 90
Maximum Output
Impedance
Drive strength = high 45

Three-State Leakage ±0.01 ±1 µA
Three-State Capacitance 15 pF
Short-Circuit Current Burst drive set to high 50 mA
RESET
Internal Pullup Resistance Pulled up to DVDDIO 120 k
Output Low Voltage I
SINK
= 0.5mA 0.4 V
Output High Voltage No external load
V
DVDDIO
-
0.5
V
Input Low Voltage When driven by external source 0.8 V
Input High Voltage When driven by external source
V
DVDDIO
-
1
V
UART/LIN INTERFACE (UTX, URX)
Asynchronous mode
(system clock/32)
500
Synchronous mode (system clock/8) 2000
UART Baud Rates
LIN 2.0 compatibility (Note 3) 1 20
kbps