MAXQ7667AACM/V+ Maxim Integrated Products, MAXQ7667AACM/V+ Datasheet - Page 19

• Manufacturer Part Number: MAXQ7667AACM/V+
• Description: IC MCU-BASED DAS 16BIT 48-LQFP
• Manufacturer: Maxim Integrated Products
• Series: MAXQ™r

Specifications of MAXQ7667AACM/V+

• Core Processor: RISC
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 16
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Ram Size: 2K x 16
• Voltage - Supply (vcc/vdd): 2.25 V ~ 2.75 V
• Data Converters: A/D 5x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 48-LQFP
• Processor Series: MAXQ7667
• Core: RISC
• Data Bus Width: 16 bit
• Data Ram Size: 4 KB
• Interface Type: UART, JTAG, LIN
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: MAXQ7667EVKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 5 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

output to the FIFO automatically each time the lowpass
filter output updates, through the control of one of the
timer outputs, or through software. The device includes
a FIFO depth counter with programmable interrupt lev-
els and generates an interrupt if a FIFO overflow condi-
tion occurs. The output of the digital lowpass filter
connects to a digital comparator that can generate an
interrupt for a specified echo signal level.
The digital comparator output asserts when the echo
amplitude at the output of the digital lowpass filter cross-
es a given threshold. The comparator’s threshold level,
hysteresis, and interrupt polarity are programmable.
The MAXQ7667 incorporates a 12-bit unbuffered SAR
ADC with sample-and-hold and conversion rate up to
250ksps. The ADC allows measurements of tempera-
Figure 4. Unipolar Transfer Function
FFD
FFC
FFE
FFB
FFF
004
003
002
001
000
0
FS = REF
ZS = 0
1 LSB = REF/4096
1
Digital Comparator and Threshold Adjust
2
DIFFERENTIAL INPUT VOLTAGE (LSB)
______________________________________________________________________________________
3
Ultrasonic Distance-Measuring System
4
16-Bit, RISC, Microcontroller-Based,
FULL-SCALE
TRANSITION
FS - 1.5 LSB
SAR ADC
FS
ture, battery voltage, or other parameters using five sin-
gle-ended or two fully differential analog inputs
(AIN0–AIN4). All of the analog inputs have a range of 0
to V
The SAR ADC supports three different conversion start
sources: timers, ADC control input (ADCCTL), and soft-
ware write. The conversion start source triggers the
ADC acquisition and conversion. The system clock pro-
vides the ADC clock frequency programmable to 1/2,
1/4, 1/8, or 1/16 of the system clock. Use internal
bandgap reference, external reference, or AVDD for
voltage reference of the SAR ADC. Figure 3 shows a
simplified block diagram of the SAR ADC.
The output of the SAR ADC is straight binary in unipolar
mode and two’s complement in bipolar mode. Figures 4
and 5 show the ADC transfer functions in unipolar
mode and bipolar mode.
Figure 5. Bipolar Transfer Function
REF
7FF
7FE
001
000
FFF
800
FFE
801
in unipolar mode and ±V
+FS = REF/2
ZS = 0
-FS = -REF/2
1 LSB = REF/4096
-FS
-FS + 0.5 LSB
DIFFERENTIAL INPUT VOLTAGE (LSB)
FULL-SCALE
TRANSITION
0
REF
+FS - 1.5 LSB
/2 in bipolar mode.
+FS
19