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參數(shù)資料
| 型號： | 40430X |
| 英文描述： | 4kbit EEPROM, Triple Voltage Monitor with Integrated CPU Supervisor |
| 中文描述： | 4kbit的EEPROM，三電壓監(jiān)視器集成CPU監(jiān)控 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 421K |
| 代理商： | 40430X |
X40430/X40431 – Preliminary Information
Characteristics subject to change without notice.
5 of 24
REV 1.2.3 11/28/00
www.xicor.com
Figure 3. V
TRIPX
Set/Reset Conditions
V
CC
/V2MON/V3MON
V
TRIPX
V
P
t
WC
A0h
0
7
7
0
7
0
SCL
WDO
SDA
(X = 1, 2, 3)
00h
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microproces-
sor activity by monitoring the SDA and SCL pins. The
microprocessor must toggle the SDA pin HIGH to LOW
periodically, while SCL also toggles from HIGH to LOW
(this is a start bit) followed by a stop condition prior to
the expiration of the watchdog time out period to pre-
vent a WDO signal going active. The state of two non-
volatile control bits in the Status Register determine
the watchdog timer period. The microprocessor can
change these watchdog bits by writing to the X40430/
31 control register (also refer to page 20).
Figure 4. Watchdog Restart
V1, V2 AND V3 THRESHOLD PROGRAM
PROCEDURE
The X40430 is shipped with standard V1, V2 and V3
threshold (V
TRIP1,
V
TRIP2,
V
TRIP3
) voltages. These
values will not change over normal operating and stor-
age conditions. However, in applications where the
standard thresholds are not exactly right, or if higher
precision is needed in the threshold value, the X40430
trip points may be adjusted. The procedure is described
below, and uses the application of a high voltage control
signal.
Setting a V
TRIPx
Voltage (x=1, 2, 3)
There are two procedures used to set the threshold
voltages (V
TRIPx
), depending if the threshold voltage to
be stored is higher or lower than the present value. For
example, if the present V
TRIPx
is 2.9 V and the new
V
TRIPx
is 3.2 V, the new voltage can be stored directly
into the V
TRIPx
cell. If however, the new setting is to be
lower than the present setting, then it is necessary to
“reset” the V
TRIPx
voltage before setting the new value.
Setting a Higher V
TRIPx
Voltage (x=1, 2, 3)
To set a V
TRIPx
threshold to a new voltage which is
higher than the present threshold, the user must apply
the desired V
TRIPx
threshold voltage to the corre-
sponding input pin (Vcc(V1MON), V2MON or V3MON).
The Vcc(V1MON), V2MON and V3MON must be tied
together during this sequence. Then, a programming
voltage (Vp) must be applied to the WDO pin before a
START condition is set up on SDA. Next, issue on the
SDA pin the Slave Address A0h, followed by the Byte
Address 01h for V
TRIP1
, 09h for V
TRIP2
, and 0Dh for
V
TRIP3
, and a 00h Data Byte in order to program
V
TRIPx
. The STOP bit following a valid write operation
initiates the programming sequence. Pin WDO must
then be brought LOW to complete the operation
SCL
SDA
.6μs
1.3μs
Timer Start
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 40430A | 4kbit EEPROM, Triple Voltage Monitor with Integrated CPU Supervisor |
| 40430B | 4kbit EEPROM, Triple Voltage Monitor with Integrated CPU Supervisor |
| 4043B | Quadruple R/S latch with 3-state outputs |
| 4044-UCA | 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit |
| 4044-UCB | 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 404310 | 制造商:MAGNUM / COOPER 功能描述: |
| 40431-0010 | 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:MS4800-ADPT-TXS |
| 40431-0020 | 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:MS4800-ADPT-TXM |
| 40431-0030 | 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:MS4800-ADPT-RX |
| 40-4310-1-02 | 制造商:Concord Electronics Inc 功能描述: |
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