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參數(shù)資料
| 型號： | DS21348GN |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Digital Transmission Interface |
| 英文描述： | DATACOM, PCM TRANSCEIVER, BGA49 |
| 封裝： | CABGA-49 |
| 文件頁數(shù)： | 26/44頁 |
| 文件大?。?/td> | 1078K |
| 代理商： | DS21348GN |
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MAX8660/MAX8660A/MAX8660B/MAX8661
High-Efficiency, Low-IQ, PMICs with Dynamic
Voltage Management for Mobile Applications
32
Voltage Monitors, Reset,
and Undervoltage-Lockout Functions
Undervoltage and Overvoltage Lockout
When the VIN is below VUVLO (typically 2.35V), the
MAX8660/MAX8661 enter its undervoltage-lockout
mode (UVLO). UVLO forces the device to a dormant
state. In UVLO, the input current is very low (1.5A)
and all regulators are off. RSO and LBO are forced low
when the input voltage is between 1V (typ) and VUVLO.
The I2C does not function in UVLO, and the I2C register
contents are reset in UVLO.
When the input voltage is above VOVLO (typically 6.35V)
the MAX8660/MAX8661 enter overvoltage-lockout mode
(OVLO). OVLO mode protects the MAX8660/
MAX8661 from high-voltage stress. In OVLO, the input
current is 25A and all regulators are off. RSO is held
low, the I2C does not function, and register contents are
reset in OVLO. LBO continues to function in OVLO; how-
ever, since LBO is typically pulled up to V8
(
VCC_BBATT), LBO appears to go low in OVLO because
V8 is disabled. Alternatively, LBO may be pulled up to IN.
Reset Output (
RSO) and MR Input
RSO is an open-drain reset output. As shown in Figure
1, RSO typically connects to the
nRESET input of the
applications processor and is pulled up to V8
(
VCC_BBATT). A low on nRESET causes the processor
to enter its reset state.
RSO is forced low when one or more of the following
conditions occur:
MR is low.
V8 is below VRSOTH (2.2V falling typ).
VIN is below VUVLO (2.35V typ).
VIN is above VOVLO (6.35V typ).
RSO is high impedance when all of the following condi-
tions are satisfied:
MR is high.
V8 is above VRSOTH (2.35V rising typ).
VUVLO < VIN < VOVLO.
The RSO deassert delay (tVBHRSTH = 24ms typ) has
expired.
When RSO goes low, the MAX8660/MAX8661 I2C regis-
ters are reset to their default values.
If the MR feature is not required, connect MR high. If
the RSO feature is not required, connect RSO low.
Low-Battery Detector (
LBO, LBF, LBR)
LBO is an open-drain output that typically connects to the
nBATT_FAULT input of the applications processor to indi-
cate that the battery has been removed or discharged
(Figure 1). LBO is typically pulled up to V8 (
VCC_BBATT).
LBR and LBF monitor the input voltage (usually a bat-
tery) and trigger the LBO output (Figure 7). The truth
table in Figure 7 shows that LBO is high impedance
when the voltage from LBR to AGND (VLBR) exceeds
the low-battery rising threshold (VLBRTH = 1.25V typ).
LBO is low when the voltage from LBF to AGND (VLBF)
falls below the low-battery falling threshold (VLBFTH =
1.20V typ). On power-up, the LBR threshold must be
exceeded before LBO deasserts.
Connecting LBF to LBR and to a two-resistor voltage-
divider sets a 50mV hysteresis referred to LBF (hystere-
sis at the battery voltage is scaled up by the resistor
value), connecting LBF and LBR separately to a three-
resistor voltage-divider (Figure 7) allows the falling
threshold and rising threshold to be set separately
(achieving larger hysteresis). The Figure 7 resistor val-
ues are selected as a function of the desired falling
(VLBOF) and rising (VLBOR) thresholds as follows:
First, select R3 in the 100k
to 1M range:
RR x
V
x
V
RR x
Vx V
LBOR
LBRTH
LBFTH
LBOF
LBFTH
LBOR
LBRTH
LBOF
13
1
23
1
=
=
MAX8660
MAX8661
VLBFTH
1.200V
VLBRTH
1.250V
SQ
R
LBR
LBF
IN
R3
R2
R1
AGND
LBO
+
V8
(VCC_BBATT)
VLBF < VLBFTH
VLBR < VLBRTH
0
LBF
LBR
TRUTH TABLE
LBO
VLBF < VLBFTH
VLBR > VLBRTH
0
VLBF > VLBFTH
VLBR < VLBRTH
HOLD
VLBF > VLBFTH
VLBR > VLBRTH
1
Figure 7. Low-Battery Detector Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
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| DS21348G | DATACOM, PCM TRANSCEIVER, BGA49 |
| DS21Q348N | DATACOM, PCM TRANSCEIVER, PBGA144 |
| DS21Q348 | DATACOM, PCM TRANSCEIVER, PBGA144 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS21348GN+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348GNB | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348GN-C01 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348T | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21348T+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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