參數(shù)資料
型號(hào)： 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(yè)數(shù)： 6/40頁(yè)
文件大?。?/td> 255K
代理商： MAX6889ETJ+
MAX6889/MAX6890/MAX6891
EEPROM-Programmable, Octal/Hex/Quad,
Power-Supply Sequencers/Supervisors
14
______________________________________________________________________________________
1) Apply a voltage between 2.7V and 5.5V to one of
VCC or IN2–IN5.
2) Program the internal/external VCC power EEPROM
at AEh, Bit[2] = 1 (see Table 22).
3) Power down the device.
Subsequent power-ups and software reboots require
an externally supplied VCC to ensure the device is fully
operational.
The MAX6889/MAX6890/MAX6891 also generate a dig-
ital supply voltage (DBP) for the internal logic circuitry
and the EEPROM. Bypass DBP to GND with a 1F
ceramic capacitor installed as close to the device as
possible. The nominal DBP output voltage is 2.55V. Do
not use DBP to provide power to external circuitry.
Inputs
The MAX6889/MAX6890/MAX6891 contain multiple
logic and voltage detector inputs. Each voltage detec-
tor input is monitored for undervoltage thresholds.
Table 1 summarizes these various inputs. Set the
threshold voltage for each voltage detector input with
registers 00h–07h. Each threshold voltage is an under-
voltage threshold. Set the threshold range for each volt-
age detector with register 08h.
High-Voltage Input (IN1)
IN1 offers threshold voltages of 2.5V to 13.2V in 50mV
increments, or 1.25V to 7.625V in 25mV increments.
Use the following equations to set the threshold volt-
ages for IN1:
where VTH is the desired threshold voltage and x is the
decimal code for the desired threshold (Table 2). For
the 2.5V to 13.2V range, x must equal 214 or less; oth-
erwise the threshold exceeds the maximum operating
voltage of IN1.
IN2–IN7
The IN2–IN7 positive voltage detectors monitor volt-
ages from 1V to 5.5V in 20mV increments, 0.5V to
3.05V in 10mV increments, or 0.1667V to 1.0167V in
3.3mV increments in high-Z mode. Use the following
equations to set the threshold voltages for IN_:
where VTH is the desired threshold voltage and x is the
decimal code for the desired threshold (Table 3). For
the 1V to 5.5V range, x must equal 225 or less; other-
wise the threshold exceeds the maximum operating
voltage of IN2–IN7.
High-Voltage Input (IN8)
Configure IN8 to detect positive thresholds from 2.5V to
15.25V in 50mV increments, 1.25V to 7.625V in 25mV
increments, or 0.1667V to 1.0167V in 3.3mV increments
in high-Z mode. Use the following equations to set the
threshold voltages for IN8:
where VTH is the desired threshold voltage and x is the
decimal code for the desired threshold (Table 4).
x
VV
V
for
V to
V range
x
VV
V
for
V to
V range
x
VV
V
for
V to
V high Z range
TH
=
25
005
2 5
15 25
125
0 025
1 25
7 625
0 1667
0 0033
0 1667
1 0167
.
..
.
..
.
..
x
VV
V
for V to
V range
x
VV
V
for
V to
V range
x
VV
V
for
V to
V high Z range
TH
=
1
002
15 5
05
01
05
305
0 1667
0 0033
0 1667
1 0167
.
..
.
..
x
VV
V
for
V to
V range
x
VV
V
for
V to
V range
TH
=
=
25
005
2 5
13 2
125
0 025
1 25
7 625
.
..
.
..
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT
RANGE
DESCRIPTION
00h
80h
[7:0]
IN1 undervoltage detector threshold (V1) (see equations in the Inputs section)
08h
88h
[0]
IN1 range selection. 0 = 2.5V to 13.2V range in 50mV increments. 1 = 1.25V to 7.625V
range in 25mV increments.
09h
89h
[0]
Must be set to “0” for normal operation
Table 2. IN1 Threshold Settings
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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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)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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