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參數(shù)資料
| 型號(hào)： | LTC2902-2CGN |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Programmable Quad Supply Monitor with Adjustable Reset Timer and Supply Tolerance |
| 中文描述： | 可編程四路電源監(jiān)視器可調(diào)復(fù)位定時(shí)器和供應(yīng)公差 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 206K |
| 代理商： | LTC2902-2CGN |
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10
LTC2902
2902f
APPLICATIOU
Power-Up
On power-up, the larger of V1 or V2 will power the drive
circuits for the RST and the COMPX pins. This ensures
that the RST and COMPX outputs will be low as soon as
V1 or V2 reaches 1V. The RST and COMPX outputs will
remain low until the part is programmed. After program-
ming, if any one of the V
X
inputs is below its programmed
threshold, RST will be a logic low. Once all the V
X
inputs
rise above their thresholds, an internal timer is started
and RST is released after the programmed delay time. If
V
CC
< (V3 – 1) and V
CC
< 2.4V, the V3 input impedance
will be low (1k
typ).
W
U
U
Monitor Programming
The LTC2902 input voltage combination is selected by
placing the recommended resistor divider from V
REF
to
GND and connecting the tap point to V
PG
, as shown in
Figure 4. Table 1 offers recommended 1% resistor values
for the various modes. The last column in Table 1 speci-
fies optimum V
PG
/V
REF
ratios (
±
0.01) to be used when
pro
gramming with a ratiometric DAC.
During power-up, once V1 or V2 reaches 2.4V (max), the
monitor enters a programming period of approximately
150
μ
s during which the voltage on the V
PG
pin is sampled
and the monitor is configured to the desired input combi-
nation. Do not add capacitance to the V
PG
pin. Immediately
after programming, the comparators are enabled and
supply monitoring will begin.
Supply Monitoring
The LTC2902 is a low power, high accuracy program-
mable quad supply monitoring circuit with four nondelayed
monitor outputs, a common reset output and selectable
supply thresholds. Reset timing is adjustable using an
external capacitor. Single pin programming selects 1 of 16
input voltage monitor combinations. Two digital inputs
select one of four supply tolerances (5%, 7.5%, 10% or
12.5%). All four voltage inputs must be above predeter-
mined thresholds for the reset not to be invoked. The
LTC2902 will assert the reset and comparator outputs
during power-up, power-down and brownout conditions
on any one of the voltage inputs.
Table 1. Voltage Threshold Programming
V
PG
V
REF
0.000
0.094
0.156
0.219
0.281
0.344
0.406
0.469
0.531
0.594
0.656
0.719
0.781
0.844
0.906
1.000
MODE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
V1 (V)
5.0
5.0
3.3
3.3
3.3
5.0
5.0
5.0
5.0
5.0
3.3
3.3
3.3
5.0
5.0
5.0
V2 (V)
3.3
3.3
2.5
2.5
2.5
3.3
3.3
3.3
3.0
3.0
2.5
2.5
2.5
3.3
3.3
3.0
V3 (V)
ADJ
ADJ
ADJ
ADJ
1.5
2.5
2.5
2.5
2.5
ADJ
1.8
1.8
1.8
1.8
1.8
1.8
V4 (V) R1 (k
) R2 (k
)
ADJ
Open
–ADJ
93.1
ADJ
86.6
–ADJ
78.7
ADJ
71.5
ADJ
66.5
1.8
59.0
1.5
53.6
ADJ
47.5
ADJ
40.2
1.5
34.8
ADJ
28.0
–ADJ
22.1
–ADJ
16.2
ADJ
9.53
ADJ
Short
Short
9.53
16.2
22.1
28.0
34.8
40.2
47.5
53.6
59.0
66.5
71.5
78.7
86.6
93.1
Open
Figure 4. Monitor Programming
12
11
10
R1
1%
R2
1%
2902 F04
V
REF
V
PG
GND
LTC2902
The inverting inputs on the V3 and/or V4 comparators are
set to 0.5V when the positive adjustable modes are selected
and with T0 and T1 low (5% tolerance) (Figure 5). The tap
point on an external resistive divider, connected between
the positive voltage being sensed and ground, is connected
to the high impedance noninverting inputs (V3, V4). The
trip voltage is calculated from:
V
V
R
R
TRIP
=
+
0 5
.
1
3
4
Once the resistor divider is set in the 5% tolerance mode,
there is no need to change the divider for the other
tolerance modes (7.5%, 10%, 12.5%) because the inter-
nal reference is scaled accordingly, moving the trip point
in –2.5% increments.
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| LTC2902-2CGN#PBF | 功能描述:IC MONITOR SUPPLY QUAD 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極，開路漏極 復(fù)位:高有效/低有效 復(fù)位超時(shí):最小為 250 ms 電壓 - 閥值:4.37V，4.62V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:1337 (CN2011-ZH PDF) |
| LTC2902-2CGN#TR | 功能描述:IC MONITOR SUPPLY QUAD 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| LTC2902-2CGN#TRPBF | 功能描述:IC MON SUPP QD W/RST&SEL 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
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