- 您現在的位置：買賣IC網 > PDF目錄371255 > X40626S14-2.7A RTC Module With CPU Supervisor PDF資料下載
參數資料
| 型號： | X40626S14-2.7A |
| 元件分類： | CPU監(jiān)測 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 時鐘模塊CPU監(jiān)控 |
| 文件頁數： | 3/23頁 |
| 文件大小： | 516K |
| 代理商： | X40626S14-2.7A |
X40626
REV 1.1.15 2/11/04
Characteristics subject to change without notice.
3 of 23
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X40626 activates a Power
On Reset Circuit that pulls the RESET pin active. This
signal provides several benefits.
– It prevents the system microprocessor from starting
to operate with insufficient voltage.
– It prevents the processor from operating prior to sta-
bilization of the oscillator.
– It allows time for an FPGA to download its configura-
tion prior to initialization of the circuit.
– It prevents communication to the EEPROM, greatly
reducing the likelihood of data corruption on power up.
When V
CC
exceeds the device V
for t
PURST
(200ms nominal) the circuit releases
RESET allowing the system to begin operation.
TRIP
threshold value
LOW VOLTAGE MONITORING
During operation, the X40626 monitors the V
and asserts RESET if supply voltage falls below a pre-
set minimum V
TRIP
. The RESET signal prevents the
microprocessor from operating in a power fail or brown-
out condition. The RESET signal remains active until
the voltage drops below 1V. It also remains active until
V
CC
returns and exceeds V
TRIP
CC
level
for 200ms.
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microprocessor
activity by monitoring the SDA and SCL pins. The
microprocessor must toggle the SDA pin HIGH to LOW
periodically, while SCL is HIGH (this is a start bit) prior to
the expiration of the watchdog time-out period to prevent
a RESET signal. The state of two nonvolatile control bits
in the Status Register determine the watchdog timer
period. The microprocessor can change these watchdog
bits, or they may be “l(fā)ocked” by tying the WP pin HIGH.
EEPROM INADVERTENT WRITE PROTECTION
When RESET goes active as a result of a low voltage
condition or Watchdog Timer Time-Out, any in-progress
communications are terminated. While RESET is
active, no new communications are allowed and no
non-volatile write operation can start. Non-volatile
writes in-progress when RESET goes active are
allowed to finish.
Additional protection mechanisms are provided with
memory Block Lock and the Write Protect (WP) pin.
These are discussed elsewhere in this document.
V
CC
/V
2MON
THRESHOLD RESET PROCEDURE
The X40626 is shipped with a standard V
(V
TRIP
) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard V
TRIP
higher precision is needed in the V
X40626 threshold may be adjusted. The procedure is
described below, and uses the application of a nonvola-
tile control signal.
CC
threshold
is not exactly right, or if
TRIP
value, the
Setting the V
This procedure is used to set the V
lower voltage value. It is necessary to reset the trip
point before setting the new value.
TRIP
Voltage
TRIP
to a higher or
The V
sequence.
CC
and V2MON must be tied together during this
Figure 1. Set V
TRIP
Level Sequence (V
CC
/V
2MON
= desired V
TRIP
values, WP = 12-15V when WEL bit set)
0 1 2 3 4 5 6 7
SCL
SDA
A0H
0 1 2 3 4 5 6 7
00H
WP
V
P
= 12-15V
0 1 2 3 4 5 6 7
xxH*
0 1 2 3 4 5 6 7
00H
*for V
VTRIP2
address is 0DH
for V
TRIP
address is 01H
相關PDF資料 |
PDF描述 |
|---|---|
| X40626S14I | RTC Module With CPU Supervisor |
| X40626S14I-2.7 | RTC Module With CPU Supervisor |
| X40626S14I-2.7A | RTC Module With CPU Supervisor |
| X40626V14 | RTC Module With CPU Supervisor |
| X40626V14-2.7 | RTC Module With CPU Supervisor |
相關代理商/技術參數 |
參數描述 |
|---|---|
| X40626S14-4.5A | 功能描述:IC SUPERVISOR CPU DUAL 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
| X40626S14-4.5AT1 | 功能描述:IC SUPERVISOR CPU DUAL 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
| X40626S14I | 功能描述:IC SUPERVISOR CPU DUAL 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
| X40626S14I-2.7 | 功能描述:IC SUPERVISOR CPU DUAL 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
| X40626S14I-2.7A | 功能描述:IC SUPERVISOR CPU DUAL 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數目:1 輸出:- 復位:低有效 復位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復。