MAXQ612 Maxim, MAXQ612 Datasheet - Page 31

• Manufacturer Part Number: MAXQ612
• Description: The MAXQ612/MAXQ622 are low-power, 16-bit MAXQ® microcontrollers designed for low-power applications including universal remote controls, consumer electronics, and white goods
• Manufacturer: Maxim

Figure 6. Stop Mode Power-Fail Detection States with Power-Fail Monitor Enabled
Table 6. Stop Mode Power-Fail Detection States with Power-Fail Monitor Enabled
STATE
A
B
C
D
E
F
INTERNAL RESET
(ACTIVE HIGH)
POWER-FAIL
V
(Periodically)
V
V
PFW
POR
RST
STOP
On
On
On
On
On
Off
______________________________________________________________________________________
V
DD
A
REGULATOR
INTERNAL
B
Infrared Module and Optional USB
Off
Off
On
Off
Off
Off
t < t
PFW
OSCILLATOR
t ≥ t
CRYSTAL
PFW
16-Bit Microcontrollers with
C
Off
Off
On
Off
Off
Off
RETENTION
SRAM
Yes
Yes
Yes
Yes
Yes
—
Application enters stop mode.
V
CPU in stop mode.
Power drop too short.
Power-fail not detected.
V
Power-fail warning detected.
Turn on regulator and crystal.
Crystal warmup time, t
Exit stop mode.
Application enters stop mode.
V
CPU in stop mode.
V
Power-fail detected.
CPU goes into reset.
Power-fail monitor turns on periodically.
V
Device held in reset. No operation allowed.
DD
RST
DD
POR
DD
> V
> V
< V
D
< V
< V
RST
RST
POR
DD
DD
.
.
.
< V
< V
COMMENTS
PFW
t ≥ t
RST
PFW
.
.
XTAL_RDY
E
F
.
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