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參數資料
| 型號： | ADM13305 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Processor Supervisors with Watchdog |
| 中文描述： | 雙處理器監控器，帶有看門狗 |
| 文件頁數： | 10/12頁 |
| 文件大小： | 214K |
| 代理商： | ADM13305 |
ADM13305
THEORY OF OPERATION
The ADM13305 is a dual voltage supervisor designed to
monitor two supplies and provide a reset signal to DSP and
microprocessor-based systems.
There are five models available, all of which feature a combina-
tion of internally pretrimmed undervoltage threshold options
for monitoring 1.8 V, 2.5 V, 3.3 V, and 5 V supplies. There is also
an adjustable input option with an undervoltage threshold of 0.6 V
The ADM13305-18, ADM13305-25, and ADM13305-33 have
two internally fixed thresholds, while the ADM13305-4 and
ADM13305-5 offer one internally fixed threshold and one
externally programmable threshold via a resistor string. See
the Ordering Guide for a list of all available options.
INPUT CONFIGURATION
The ADM13305 is powered through V
DD
. To increase noise
immunity in noisy applications, place a 0.1 μF capacitor
between the V
DD
input and ground.
The SENSEv inputs are resistant to short power supply glitches.
Do not allow an unused SENSEv input to float or to be grounded,
instead connect it to a supply voltage greater than its specified
threshold voltage.
Typically, the threshold voltage at each adjustable SENSEv input
is 0.6 V To monitor a voltage greater than 0.6 V connect a resistor
divider network to the device as depicted in Figure 13, where,
+
=
R2
Rev. 0 | Page 10 of 12
R2
R1
V
MONITERED
V
6
0
R1
R2
MONITORED VOLTAGE
V
REF
= 0.6V
Figure 13. Setting the Adjustable Monitor
RESET OUTPUT
The reset outputs are guaranteed to be in the correct state for
V
DD
down to 1.1 V. During power-up, RESET is asserted when
the supply voltage becomes greater than 1.1 V.
0
SENSEv
V
(NOM)
V
IT–
0
1
RESET
t
d
t
d
t
t
Figure 14. Reset Timing Diagram
Once the supplies monitored at the SENSEv pins rise above
their associated threshold level, the RESET signal remains low
for the reset timeout period before deasserting. Subsequently, if
either of the supplies monitored by the SENSEv pins falls below
its associated threshold the RESET output reasserts.
The ADM13305 features both an active-low, push-pull RESET
output and an active-high, push-pull RESET output.
WATCHDOG TIMER
The ADM13305 features a watchdog timer that monitors
microprocessor activity. A timer circuit is cleared with every
low-to-high or high-to-low logic transition on the watchdog
input pin (WDI). If the timer counts through the preset
watchdog timeout period of 1.6 sec, RESET is asserted, as
shown in
.
Figure 15
The microprocessor is required to toggle the WDI pin to avoid
being reset. Therefore, failure of the microprocessor to toggle
WDI within the timeout period indicates a code execution error
and the reset pulse generated restarts the microprocessor in a
known state. The watchdog timer can be disabled by leaving
WDI floating.
0
0
1
RESET
0
1
WDI
t
WD
t
d
t
t
Figure 15. Watchdog Timing Diagram
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADM13305-18ARZ | 功能描述:IC SUPERVISR DUAL 3.3/1.8V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:400 系列:- 類型:備用電池電路 監視電壓數目:1 輸出:開路漏極，推挽式 復位:高有效/低有效 復位超時:最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
| ADM13305-18ARZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Processor Supervisors with Watchdog |
| ADM13305-18ARZ-RL7 | 功能描述:IC SUPERVISORY CIRCUIT DL 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:400 系列:- 類型:備用電池電路 監視電壓數目:1 輸出:開路漏極，推挽式 復位:高有效/低有效 復位超時:最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
| ADM13305-18ARZ-RL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Processor Supervisors with Watchdog |
| ADM13305-25ARZ | 功能描述:IC SUPERVISR DUAL 3.3/2.5V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:400 系列:- 類型:備用電池電路 監視電壓數目:1 輸出:開路漏極，推挽式 復位:高有效/低有效 復位超時:最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
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