Rainbow Electronics MAXQ7667 - Manual (Page 14)

MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
14 ______________________________________________________________________________________
BURST ENABLE BURST
TRANSDUCER
ECHON
ECHOP
GATE5
DVDDIO
BSP129
BURST OUTPUT
DUTY CYCLE
AND PULSE
COUNTER
2mV P-P 0V
SIGMA-
DELTA
ADC
12-BIT
SAR ADC
0.47 µF 0.47 µF
VOLTAGE
REFERENCE
THRESHOLD
ADJUST
MAXQ20 RISC
µC
PROGRAMMABLE
PLL
CLOCK PRESCALER
DIVIDE BY 1 TO 128
DIGITAL
BANDPASS
FILTER
LNA
SCHEDULE
TIMER
CRYSTAL
OSCILLATOR
13.5MHz
RC
OSCILLATOR
WATCHDOG
POR/
BROWNOUT
INTERFACE
MODULE
LIN
TRANSCEIVER
CONNECTOR
TIMER 2
PO.6/T2 PO.7/T2B PO.3/T0/ADCCTL PO.4/T0B PO.5/T1
RESET AGND
TIMER 1 TIMER 0
FULL-
WAVE
RECTIFIER
DIGITAL
LOWPASS
FILTER
INTERRUPT
FIFO
ROM
FLASH
RAM
16 x 16
HW MULT
PLUS ACCUM
AIN0
REF REFBG
AIN1
AIN2
AIN3 THERMISTOR
BATTERY+
AIN4
FILT
24k Ω
33nF
330pF
AVDD
20pF
XIN XOUT
16MHz
0.1 µF
0.01 µF
0.01 µF
470pF
470pF
20pF
REG3P3
AVDD 0.1 µF
REG2P5
DVDD
DGND
GPIO/JTAG
GPIO/SPI
P0.0/URX
Rx
LIN
+8V TO
+20V
LIN
GND
V+
Tx
P0.1/UTX
0.1 µF
MAXQ7667
Typical Application Circuit/Functional Diagram