MAXQ61HX-0000+ MAXIM [Maxim Integrated Products], MAXQ61HX-0000+ Datasheet - Page 21

• Manufacturer Part Number: MAXQ61HX-0000+
• Description: 16-BIt Microcontroller with Infrared Module
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 4. Stop Mode Power-Fail Detection States with Power-Fail Monitor Disabled (continued)
The low-power, high-performance RISC architecture of
this device makes it an excellent fit for many portable or
battery-powered applications. It is ideally suited for
applications such as universal remote controls that
require the cost-effective integration of IR transmit/
receive capability.
Careful PCB layout significantly minimizes system-level
digital noise that could interact with the microcontroller
or peripheral components. The use of multilayer boards
is essential to allow the use of dedicated power planes.
The area under any digital components should be a
continuous ground plane if possible. Keep any bypass
capacitor leads short for best noise rejection and place
the capacitors as close to the leads of the devices as
possible.
CMOS design guidelines for any semiconductor require
that no pin be taken above V
Violation of this guideline can result in a hard failure
(damage to the silicon inside the device) or a soft fail-
ure (unintentional modification of memory contents).
Voltage spikes above or below the device’s absolute
maximum ratings can potentially cause a devastating
IC latchup.
STATE
D
E
F
POWER-FAIL
(Periodically)
16-Bit Microcontroller with Infrared Module
Off
On
Off
Applications Information
______________________________________________________________________________________
Grounds and Bypassing
REGULATOR
INTERNAL
Off
Off
Off
DD
or below GND.
OSCILLATOR
CRYSTAL
Off
Off
Off
RETENTION
SRAM
Yes
Yes
Microcontrollers commonly experience negative volt-
age spikes through either their power pins or general-
purpose I/O pins. Negative voltage spikes on power
pins are especially problematic as they directly couple
to the internal power buses. Devices such as keypads
can conduct electrostatic discharges directly into the
microcontroller and seriously damage the device.
System designers must protect components against
these transients that can corrupt system memory.
Designers must have the following documents to fully
use all the features of this device. This data sheet con-
tains pin descriptions, feature overviews, and electrical
specifications. Errata sheets contain deviations from
published specifications. The user’s guides offer
detailed information about device features and opera-
tion. The following documents can be downloaded from
www.maxim-ic.com/microcontrollers.
• This MAXQ61H data sheet, which contains electrical/
• The MAXQ61H revision-specific errata sheet
• The MAXQ 610 User's Guide , which contains detailed
—
timing specifications and pin descriptions.
(www.maxim-ic.com/errata).
information on core features and operation, including
programming.
Application enters stop mode.
V
CPU in stop mode.
V
An interrupt occurs that causes the CPU to exit
stop mode.
Power-fail monitor is turned on, detects a power-
fail, puts CPU in reset.
Power-fail monitor is turned on periodically.
V
Device held in reset. No operation allowed.
DD
POR
DD
> V
< V
Additional Documentation
< V
RST
POR
DD
.
.
< V
RST
COMMENTS
.
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