參數(shù)資料
型號： MAX6889ETJ+
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors
中文描述： 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC32
封裝： 5 X 5 MM, TQFN-32
文件頁數(shù)： 5/40頁
文件大?。?/td> 255K
代理商： MAX6889ETJ+
MAX6889/MAX6890/MAX6891
EEPROM-Programmable, Octal/Hex/Quad,
Power-Supply Sequencers/Supervisors
______________________________________________________________________________________
13
Powering the
MAX6889/MAX6890/MAX6891
The MAX6889/MAX6890/MAX6891 derive power from
the voltage detector inputs: IN1–IN5 (MAX6889/
MAX6890), IN1–IN4 (MAX6891), or an external VCC
supply. A virtual diode-ORing scheme selects the posi-
tive input that supplies power to the device (see the
Functional Diagram). IN1 must be at least 4V, or one of
IN2–IN5 (MAX6889/MAX6890)/IN2–IN4 (MAX6891)
must be at least 2.7V to ensure device operation. An
internal LDO regulates IN1 down to 5.4V.
The highest input voltage on IN2–IN5 (MAX6889/
MAX6890)/IN2–IN4 (MAX6891) supplies power to the
device, unless VIN1 > 6.5V, in which case IN1 supplies
power to the device. For 4V < VIN1 < 6.5V and one of
VIN2–VIN5 > 2.7V, the input power source cannot be
determined due to the dropout voltage of the LDO.
Internal hysteresis ensures that the supply input that ini-
tially powered the device continues to power the device
when multiple input voltages are within 50mV of
each other.
VCC powers the analog circuitry. Bypass VCC to GND
with a 1F ceramic capacitor installed as close to the
device as possible. The internal supply voltage, mea-
sured at VCC, equals the maximum of IN2–IN5 if VIN1 =
0V, or equals 5.4V when VIN1 > 6.5V. Do not use the
internally generated VCC to provide power to external
circuitry. Power cannot be supplied through high-
impedance voltage detector inputs. To externally sup-
ply power through VCC:
MAX6889/MAX6890/MAX6891
FEATURE
DESCRIPTION
High-Voltage Input IN1
2.5V to 13.2V threshold in 50mV increments.
1.25V to 7.625V threshold in 25mV increments.
Positive Voltage Input
IN2–IN7 (MAX6889)
IN2–IN6 (MAX6890)
IN2–IN4 (MAX6891)
1V to 5.5V threshold in 20mV increments.
0.5V to 3.05V threshold in 10mV increments.
0.1667V to 1.0167V threshold in 3.3mV increments in high-Z mode.
High-Voltage Input IN8
(MAX6889)
2.5V to 15.25V threshold in 50mV increments.
1.25V to 7.625V threshold in 25mV increments.
0.1667V to 1.0167V threshold in 3.3mV increments in high-Z mode.
Programmable Outputs
PO1–PO10 (MAX6889)
PO1–PO8 (MAX6890)
PO1–PO5 (MAX6891)
Active-high or active-low.
Open-drain or weak pullup output.
Dependent on
MR, MARGIN, IN_, GPI_, and WD.
Programmable reset timeout periods of 25s, 1.5625ms, 6.25ms, 25ms, 50ms, 200ms, 400ms,
or 1.6s.
General-Purpose Logic Inputs:
GPI1–GPI4
(MAX6889–MAX6890)
GPI1–GPI3 (MAX6891)
Active-high or active-low logic levels.
Configure GPI_ as inputs to the watchdog timer or the programmable output stages.
Watchdog Timer
Clear dependent on any combination of one GPI_ input and one programmable output, a GPI_
input only, or a programmable output only.
Initial watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s.
Normal watchdog timeout period of 6.25ms, 25ms, 100ms, 400ms, 1.6s, 6.4s, 25.6s, or 102.4s.
Watchdog enable/disable.
Manual Reset Input (
MR)
Forces PO_ into the active output state when
MR = GND.
PO_ deassert after
MR releases high and the PO_ timeout period expires.
VCC Power Mode
Programs whether the device is powered from the highest IN_ input or from an external supply
connected to VCC.
Write Disable
Locks user EEPROM based on PO_.
Configuration Lock
Locks configuration registers and EEPROM.
Table 1. Programmable Features
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6889ETJ+ 功能描述:監(jiān)控電路 EEPROM-Prog Octal Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6889ETJ+T 功能描述:監(jiān)控電路 EEPROM-Prog Octal Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6889ETJ-T 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6889EVCMAXQ 功能描述:監(jiān)控電路 EEPROM-Programmable Octal/Hex/Quad Power-Supply Sequencers/Supervisors RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX6889EVCMAXQU 功能描述:監(jiān)控電路 Evaluation Kit/Evaluation System for the MAX6889 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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