MAXQ2000-QBX Maxim Integrated Products, MAXQ2000-QBX Datasheet - Page 26

• Manufacturer Part Number: MAXQ2000-QBX
• Description: Microcontrollers (MCU) Low-Power LCD MCU
• Manufacturer: Maxim Integrated Products

Specifications of MAXQ2000-QBX

• Processor Series: MAXQ2000
• Core: RISC
• Data Bus Width: 16 bit
• Program Memory Type: Flash
• Program Memory Size: 64 KB
• Data Ram Size: 2 KB
• Interface Type: 1-Wire, SPI, JTAG, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 50
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 2.75 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-56
• Development Tools By Supplier: MAXQ2000-KIT
• Minimum Operating Temperature: - 40 C

For maximum versatility, the MAXQ2000 generates its
internal system clock from one of five possible sources:
• Internal ring oscillator
• External high-frequency crystal or ceramic resonator,
• External high-frequency clock source
• External 32kHz crystal or ceramic resonator, using an
• External 32kHz clock source
Low-Power LCD Microcontroller
Figure 2. Clock Sources
26
using an internal oscillator
internal oscillator
____________________________________________________________________
POWER-ON
RESET
STOP
CRYSTAL KLL
INPUT
ENABLE
ENABLE
MONITOR
CRYSTAL
CRYSTAL
CRYSTAL
32kHz
RING
HF
System Timing
RESET
CLK INPUT
STARTUP
TIMER
XDOG
POWER-ON RESET
RGMD
XDOG COUNT
MAXQ2000
DIVIDER
CLOCK
WAKE-UP
TIMERS
ALARM
XDOG DONE
SELECTOR
A crystal warmup counter enhances operational relia-
bility. Each time the external crystal oscillation must
restart, such as after exiting Stop mode, the device initi-
ates a crystal warmup period of 65,536 oscillations.
This allows time for the crystal amplitude and frequency
to stabilize before using it as a clock source. While in
the warmup mode, the device can begin operation from
the internal ring oscillator and automatically switch
back to the crystal as soon as it is ready.
RING SELECT
DEFAULT
XDOG DONE
ENABLE
GENERATION
WATCHDOG
CLOCK
TIMER
RESET DOG
RGSL
SYSTEM CLOCK
SWB
INTERRUPT/SERIAL PORT
RESET
STOP
RWT
RESET
WATCHDOG RESET
WATCHDOG INTERRUPT
STOP
POWER-ON
RESET