MAXQ2000-RAX+ Maxim Integrated Products, MAXQ2000-RAX+ Datasheet - Page 28

• Manufacturer Part Number: MAXQ2000-RAX+
• Description: IC MCU 32K FLASH 68-QFN
• Manufacturer: Maxim Integrated Products
• Series: MAXQ™r

Specifications of MAXQ2000-RAX+

• Core Processor: RISC
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: 1-Wire, SPI, UART/USART
• Peripherals: LCD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 2.75 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 68-QFN Exposed Pad
• Processor Series: MAXQ
• Core: RISC
• Data Bus Width: 16 bit
• Data Ram Size: 2 KB
• Interface Type: JTAG, SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 55
• Number Of Timers: 3
• Operating Supply Voltage: 2.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Controller Family/series: MAXQ
• No. Of I/o's: 50
• Ram Memory Size: 2048Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Embedded Interface Type: SPI, UART
• Rohs Compliant: Yes
• Development Tools By Supplier: MAXQ2000-KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Low-Power LCD Microcontroller
An internal power-on reset circuit enhances system reli-
ability. This circuit forces the device to perform a
power-on reset whenever a rising voltage on V
climbs above approximately 1.8V. At this point the fol-
lowing events occur:
• All registers and circuits enter their reset state
• The POR flag (WDCN.7) is set to indicate the source
• The ring oscillator becomes the clock source and
• Code execution begins at location 8000h
The watchdog timer functions are described in the
MAXQ Family User’s Guide . Execution resumes at loca-
tion 8000h following a watchdog timer reset.
Asserting the external RESET pin low causes the device
to enter the reset state. The external reset functions as
described in the MAXQ Family User’s Guide . Execution
resumes at location 8000h after the RESET pin is
released.
Figure 3. Type-C/D Port Pin Schematic
28
of the reset
____________________________________________________________________
PI.x OR SF INPUT
SF DIRECTION
FLAG
SF OUTPUT
SF ENABLE
PD.x
PO.x
Watchdog Timer Reset
External System Reset
INTERRUPT
FLAG
Power-On Reset
CIRCUIT
DETECT
EIES.x
DDIO
TYPE-D PORT ONLY
The microcontroller uses the type C and type D bidirec-
tional I/O ports described in the MAXQ Family User’s
Guide . The use of two port types allows for maximum
flexibility when interfacing to external peripherals. Each
port has eight independent, general-purpose I/O pins
and three configure/control registers. Many pins support
alternate functions such as timers or interrupts, which are
enabled, controlled, and monitored by dedicated periph-
eral registers. Using the alternate function automatically
converts the pin to that function.
Type-C port pins have Schmitt Trigger receivers and
full CMOS output drivers, and can support alternate
functions. The pin is either tri-stated or weak pullup
when defined as an input, dependent on the state of
the corresponding bit in the output register.
Type-D port pins have Schmitt Trigger receivers and
full CMOS output drivers, and can support alternate
functions. The pin is either tri-stated or weak pullup
when defined as an input, dependent on the state of
the corresponding bit in the output register. All type-D
pins also have interrupt capability.
MAXQ2000
I/O PAD
V
DDIO
V
WEAK
DDIO
PIN.x
I/O Ports