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参数资料
| 型号： | FM3216-G |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封装： | GREEN, MS-012AB, SOIC-14 |
| 文件页数： | 17/21页 |
| 文件大小： | 424K |
| 代理商： | FM3216-G |
FM3204/16/64/256
Rev. 3.1
July 2010
Page 5 of 21
The bits VTP1 and VTP0 control the trip point of the
low voltage detect circuit. They are located in register
0Bh, bits 1 and 0.
VTP
VTP1
VTP0
2.6V
0
2.9V
0
1
3.9V
1
0
4.4V
1
The watchdog timer can also be used to assert the
reset signal (/RST). The watchdog is a free running
programmable timer. The period can be software
programmed from 100 ms to 3 seconds in 100 ms
increments via a 5-bit nonvolatile register. All
programmed settings are minimum values and vary
with temperature according to the operating
specifications. The watchdog has two additional
controls associated with its operation, a watchdog
enable bit (WDE) and timer restart bits (WR). Both
the enable bit must be set and the watchdog must
timeout in order to drive /RST active. If a reset event
occurs, the timer will automatically restart on the
rising edge of the reset pulse. If not enabled, the
watchdog timer runs but has no effect on /RST. Note
that setting the maximum timeout setting (11111b)
disables the counter to save power. The second
control is a nibble that restarts the timer preventing a
reset. The timer should be restarted after changing the
timeout value.
The watchdog timeout value is located in register
0Ah, bits 4-0, and the watchdog enable is bit 7. The
watchdog is restarted by writing the pattern 1010b to
the lower nibble of register 09h. Writing this pattern
will also cause the timer to load new timeout values.
Writing other patterns to this address will not affect
its operation. Note the watchdog timer is free-
running. Prior to enabling it, users should restart the
timer as described above. This assures that the full
timeout period will be set immediately after enabling.
The watchdog is disabled when VDD is below VTP.
The following table summarizes the watchdog bits. A
block diagram follows.
Watchdog timeout
WDT4-0
0Ah, bits 4-0
Watchdog enable
WDE
0Ah, bit 7
Watchdog restart
WR3-0
09h, bits 3-0
Figure 3. Watchdog Timer
Manual Reset
The /RST pin is bi-directional and allows the
FM32xx to filter and de-bounce a manual reset
switch. The /RST input detects an external low
condition and responds by driving the /RST signal
low for 100 ms.
Figure 4. Manual Reset
Note that an internal weak pull-up on /RST
eliminates
the
need
for
additional
external
components.
Reset Flags
In case of a reset condition, a flag will be set to
indicate the source of the reset. A low VDD reset is
indicated by the POR flag, register 09h bit 6. A
watchdog reset is indicated by the WTR flag, register
09h bit 7. Note that the flags are internally set in
response to reset sources, but they must be cleared by
the user. When the register is read, it is possible that
both flags are set if both have occurred since the user
last cleared them.
Early Power Fail Comparator
An early power fail warning can be provided to the
processor well before VDD drops out of spec. The
comparator is used to create a power fail interrupt
(NMI). This can be accomplished by connecting the
PFI pin to the unregulated power supply via a resistor
divider. An application circuit is shown below.
Figure 5. Comparator as Early Power-Fail Warning
+
-
1.2V ref
Regulator
VDD
FM32xx
To MCU
NMI input
CAL/PFO
PFI
Timebase
Counter
Watchdog
timeout
100 ms
clock
WDE
/RST
WR3-0 = 1010b to restart
FM32xx
Reset
Switch
RST
MCU
Switch
Behavior
RST
FM32xx
drives
100 ms
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