MAXQ7667AACM/V+T【PDF 5/40 页】IC MCU-BASED DAS 16BIT 48-LQFP

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MAXQ7667

16-Bit, RISC, Microcontroller-Based,

Ultrasonic Distance-Measuring System

______________________________________________________________________________________

Pin Description (continued)

PIN

NAME

FUNCTION

XOUT

Crystal Oscillator Output. Connect an external crystal or resonator between XIN and XOUT. Leave

XOUT unconnected when driving XIN with a 2.5V level clock or when an external clock source is

not used.

REG2P5

+2.5V Voltage Regulator Output

REG3P3

+3.3V Voltage Regulator Output

GATE5

+5V DVDDIO Voltage Regulator Control Output. GATE5 controls an external npn or nMOS

transistor that passes power to DVDDIO.

RESET

Reset Input/Output.

RESET is open drain with an internal pullup resistor to DVDDIO. Internal

circuitry pulls

RESET low when VDVDDIO falls below its brownout reset value or watchdog reset is

enabled and the watchdog timeout period expires. Force

RESET low externally for manual reset.

FILT

PLL VCO Control Input. Connect external filter components on FILT for the internal PLL circuit. See

the Typical Application Circuit/Functional Diagram.

27, 32

AVDD

Analog Supply Voltage. Connect all AVDD inputs directly to a +3.3V source or to REG3P3 for self-

powered operation. Bypass each AVDD to AGND with a 0.1F capacitor as close as possible to

the device.

28, 31, 33

AGND

Analog Ground. Connect all AGND nodes together. Connect to DGND at a single point.

ECHON

Negative Echo Input. AC-couple ECHON to an ultrasonic transducer.

ECHOP

Positive Echo Input. AC-couple ECHOP to an ultrasonic transducer.

REF

ADC Reference Input/Reference Buffer Output. When using the internal reference, the buffered

bandgap reference voltage (VREF) is provided for both SAR and sigma-delta ADCs. When using an

external reference, apply an external voltage source ranging between 1V and VAVDD at REF.

Disable the reference buffer when applying an external reference at REF. Bypass REF to AGND

with a 0.47F capacitor.

REFBG

+2.5V Reference Output/Reference Buffer Input. Bypass to AGND with a 0.47F capacitor.

AIN0

SAR ADC Input 0. AIN0 pairs with AIN1 in differential mode.

AIN1

SAR ADC Input 1. AIN1 pairs with AIN0 in differential mode.

AIN2

SAR ADC Input 2. AIN2 pairs with AIN3 in differential mode.

AIN3

SAR ADC Input 3. AIN3 pairs with AIN2 in differential mode.

AIN4

SAR ADC Input 4

N.C.

No Connection. Internally connected. Leave unconnected.

BURST

Burst Output. Burst is the ultrasonic transducer excitation pulse output. BURST remains in three-

state mode on power-up.

P1.0/TDO

Port 1 Data 0/JTAG Output. P1.0 is a general-purpose digital I/O. TDO is the JTAG serial data

output. Refer to the MAXQ7667 User’s Guide Sections 5 and 11.

P1.1/TMS

Port 1 Data 1/JTAG Test Mode-Select Input. P1.1 is a general-purpose digital I/O. TMS is the JTAG

mode-select input. Refer to the MAXQ7667 User’s Guide Sections 5 and 11.

P1.2/TDI

Port 1 Data 2/JTAG Input. P1.2 is a general-purpose digital I/O. TDI is the JTAG serial data input.

Refer to the MAXQ7667 User’s Guide Sections 5 and 11.

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