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参数资料
| 型号： | 1022LI-45TE13 |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 15/17页 |
| 文件大小： | 107K |
| 代理商： | 1022LI-45TE13 |
7
Preliminary Information
CAT1021, CAT1022, CAT1023
Doc No. 3009, Rev. E
embedded EEPROM is disabled for all operations,
including write operations. If the Reset output(s) are
active, in progress communications to the EEPROM are
aborted and no new communications are allowed. In this
condition an internal write cycle to the memory can not be
started, but an in progress internal non-volatile memory
write cycle can not be aborted. An internal write cycle
initiated before the Reset condition can be successfully
finished if there is enough time (5ms) before VCC reaches
the minimum value of 2V.
In addition, the CAT1021 includes a Write Protection Input
which when tied to V
CC will disable any write operations
to the device.
Watchdog Timer
The Watchdog Timer provides an independent protection
for microcontrollers. During a system failure, CAT1021/
22/23 devices will provide a reset signal after a time-out
interval of 1.6 seconds for a lack of activity. The CAT1023
is designed with the Watchdog timer feature on the WDI
pin. The CAT1021 and CAT1022 monitor the SDA line. If
WDI or SDA does not toggle within a 1.6 second interval,
the reset condition will be generated on the reset outputs.
The watchdog timer is cleared by any transition on a
monitored line.
As long as reset signal is asserted, the watchdog timer
will not count and will stay cleared.
DEVICE OPERATION
Reset Controller Description
The CAT1021/22/23 precision RESET controllers ensure
correct system operation during brownout and power
up/down conditions. They are configured with open
drain RESET outputs.
During power-up, the RESET outputs remain active
until VCC reaches the VTH threshold and will continue
driving the outputs for approximately 200ms (tPURST)
after reaching VTH. After the tPURST timeout interval, the
device will cease to drive the reset outputs. At this point
the reset outputs will be pulled up or down by their
respective pull up/down resistors.
During power-down, the RESET outputs will be active
when VCC falls below VTH. The RESET output will be
valid so long as VCC is >1.0V (VRVALID). The device is
designed to ignore the fast negative going VCC transient
pulses (glitches).
Reset output timing is shown in Figure 1.
Manual Reset Operation
The
RESET pin can operate as reset output and manual
reset input. The input is edge triggered; that is, the
RESET input will initiate a reset timeout after detecting
a high to low transition.
When
RESET I/O is driven to the active state, the 200
msec timer will begin to time the reset interval. If external
reset is shorter than 200 ms, Reset outputs will remain
active at least 200 ms.
The CAT1021/22/23 also have a separate manual reset
input. Driving the
MR input low by connecting a
pushbutton (normally open) from
MR pin to GND will
generate a reset condition. The input has an internal pull
up resistor.
Reset remains asserted while
MR is low and for the
Reset Timeout period after
MR input has gone high.
Glitches shorter than 100 ns on
MR input will not
generate a reset pulse. No external debouncing circuits
are required. Manual reset operation using
MR input is
shown in Figure 2.
Hardware Data Protection
The CAT1021/22/23 supervisors have been designed
to solve many of the data corruption issues that have
long been associated with serial EEPROMs.
Data
corruption occurs when incorrect data is stored in a
memory location which is assumed to hold correct data.
Whenever the device is in a Reset condition, the
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