MAXQ3210-EJX MAXIM [Maxim Integrated Products], MAXQ3210-EJX Datasheet - Page 17

• Manufacturer Part Number: MAXQ3210-EJX
• Description: Microcontroller with Internal Voltage Regulator, Piezoelectric Horn Driver, and Comparator
• Manufacturer: MAXIM [Maxim Integrated Products]

For maximum versatility, the MAXQ3210 generates its
internal system clock from several sources:
• External clock source, including low-cost operation
• External crystal or ceramic resonator, using the
• External RC, using the internal relaxation oscillator
• Internal ring oscillator
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.
Figure 2. Clock Sources
XT/RC
STOP
RGSL
STOP
RGSL
Microcontroller with Internal Voltage Regulator,
XTE
from 3.58MHz “Colorburst” crystal
internal oscillator
Piezoelectric Horn Driver, and Comparator
System Timing
KILL
KILL
OSCILLATOR
OSCILLATOR
OSCILLATOR
____________________________________________________________________
RESONATOR
NANO-RING
INTERNAL
CRYSTAL/
RC
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 operates from the inter-
nal 8kHz ring oscillator and can optionally switch back
to the crystal as soon as the warmup period expires.
The MAXQ3210 features an internal voltage regulator that
allows it to be powered from an external battery ranging
from approximately 6.0V to 9.5V. A low-battery detect fea-
ture can set a flag and/or trigger an interrupt when
enabled and the battery voltage falls below the V
threshold. The battery voltage is regulated to an internal
voltage (V
put pin provides 5V for use by external devices.
RESET
EWDI
RWT
EWT
RGMD
XT/RC
RC CLK
XT CLK
RESET
MAXQ3210
DIVIDER
CLOCK
DDINT
Internal Voltage Regulator
STARTUP
X-DOG
TIMER
) of approximately 5V. The REGOUT out-
DONE
SELECTOR
CLOCK
RESET
WATCHDOG
RGSL
TIMER
CLOCK
SYSTEM
CLOCK
STOP
POR
RGMD
17
BF