- 您現在的位置：買賣IC網 > PDF目錄372534 > X4325 RTC Module With CPU Supervisor PDF資料下載
參數資料
| 型號： | X4325 |
| 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： | 3/22頁 |
| 文件大?。?/td> | 126K |
| 代理商： | X4325 |
X4323/5 – Preliminary Information
Characteristics subject to change without notice.
3 of 22
REV 1.19 5/03/02
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X4323/5 activates a Power
On Reset Circuit that pulls the RESET/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 200ms (nominal) the circuit releases RESET/
RESET allowing the system to begin operation.
TRIP
threshold value
LOW VOLTAGE MONITORING
During operation, the X4323/5 monitors the V
and asserts RESET/RESET if supply voltage falls
below a preset minimum V
signal prevents the microprocessor from operating in a
power fail or brownout condition. The RESET/RESET
signal remains active until the voltage drops below 1V.
It also remains active until V
V
TRIP
for 200ms.
CC
level
TRIP
. The RESET/RESET
CC
returns and exceeds
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 is HIGH (this is a start bit) prior
to the expiration of the watchdog time out period to pre-
vent a RESET/RESET signal. The state of two nonvol-
atile 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/RESET goes active as a result of a low
voltage condition or Watchdog Timer Time Out, any in-
progress communications are terminated. While
RESET/RESET is active, no new communications are
allowed and no nonvolatile write operation can start.
Nonvolatile writes in-progress when RESET/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
THRESHOLD RESET PROCEDURE
The X4323/5 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
X4323/5 threshold may be adjusted. The procedure is
described below, and uses the application of a nonvol-
atile control signal.
CC
threshold
is not exactly right, or if
TRIP
value, the
Figure 1. Set V
TRIP
Level Sequence (V
CC
= desired V
TRIP
values 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
01h
0 1 2 3 4 5 6 7
00h
相關PDF資料 |
PDF描述 |
|---|---|
| X4643(中文) | RTC Module With CPU Supervisor |
| X4645(中文) | RTC Module With CPU Supervisor |
| X4C105 | RTC Module With CPU Supervisor |
| X4ODC5R | |
| X4ODC5R5 | 16MHZ, TQFP, IND TEMP, 5V(MCU AVR) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| X4325S8 | 功能描述:IC SUPERVISOR CPU 32K EE 8-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 |
| X4325S8-2.7 | 功能描述:IC SUPERVISOR CPU 32K EE 8-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 |
| X4325S8-2.7A | 功能描述:IC SUPERVISOR CPU 32K EE 8-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 |
| X4325S8-4.5A | 功能描述:IC SUPERVISOR CPU 32K EE 8-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 |
| X4325S8I | 功能描述:IC SUPERVISOR CPU 32K EE 8-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。