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参数资料
型号： MAX1645B
厂商： Maxim Integrated Products, Inc.
英文描述： Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting
中文描述： 高级、与化学类型无关的Level 2电池充电器，带有输入限流
文件页数： 14/32页
文件大小： 357K
代理商： MAX1645B
M
Advanced Chemistry-Independent, Level 2
Battery Charger with Input Current Limiting
14
______________________________________________________________________________________
Operating Conditions
The MAX1645B changes its operation depending on
the voltages at DCIN, BATT, V
DD,
and THM. Several
important operating states follow:
AC Present.
When DCIN is >7.5V, the battery is con-
sidered to be in an AC present state. In this condi-
tion, both the LDO and REF function properly and
battery charging is allowed. When AC is present, the
AC_PRESENT bit (bit 15) in the ChargerStatus() reg-
ister is set to 1.
Power Fail.
When DCIN is <BATT + 0.3V, the part is
in the power-fail state, since the charger does not
have enough input voltage to charge the battery. In
power fail, the PDS input PMOS switch is turned off
and the POWER_FAIL bit (bit 13) in the
ChargerStatus() register is set to 1.
Battery Present.
When THM is <91% of V
DD
, the
battery is considered to be present. The MAX1645B
uses the THM pin to detect when a battery is con-
nected to the charger. When the battery is present,
the BATTERY_PRESENT bit (bit 14) in the
ChargerStatus() register is set to 1 and charging can
proceed. When the battery is not present, all of the
registers are reset. With no battery present, the
charger performs a
“
float
”
charge to minimize con-
tact arcing on battery connection. The
“
float
”
charge
still tries to regulate the BATT pin voltage at 18.32V
with 128mA of current compliance.
Battery Undervoltage.
When BATT <2.5V, the bat-
tery is in an undervoltage state. This causes the
charger to reduce its current compliance to 128mA.
The content of the ChargingCurrent() register is unaf-
fected and, when the BATT voltage exceeds 2.7V,
normal charging resumes. ChargingVoltage() is unaf-
fected and can be set as low as 1.024V.
V
DD
Undervoltage.
When V
DD
<2.5V, the V
DD
sup-
ply is in an undervoltage state, and the SMBus inter-
face does not respond to commands. Coming out of
the undervoltage condition, the part is in its Power-
On Reset state. No charging occurs when V
DD
is
under voltage.
SMBus Interface
The MAX1645B receives control inputs from the SMBus
interface. The serial interface complies with the SMBus
specification (refer to the System Management Bus
Specification from Intel Corporation). Charger function-
ality complies with the Intel/Duracell Smart Charger
Specification for a Level 2 charger.
The MAX1645B uses the SMBus read-word and write-
word protocols to communicate with the battery being
charged, as well as with any host system that monitors
the battery-to-charger communications as a Level 2
SMBus charger. The MAX1645B is an SMBus slave
device and does not initiate communication on the bus.
It receives commands and responds to queries for sta-
tus information. Figure 3 shows examples of the SMBus
write-word and read-word protocols, and Figures 4 and
5 show the SMBus serial-interface timing.
Each communication with this part begins with the
MASTER issuing a START condition that is defined as a
falling edge on SDA with SCL high and ends with a
STOP condition defined as a rising edge on SDA with
SCL high. Between the START and STOP conditions,
the device address, the command byte, and the data
bytes are sent. The MAX1645B
’
s device address is
0x12 and supports the charger commands as
described in Tables 1
–
6.
Battery Charger Commands
ChargerSpecInfo()
The ChargerSpecInfo() command uses the read-word
protocol (Figure 3b). The command code for
ChargerSpecInfo() is 0x11 (0b00010001). Table 1 lists
the functions of the data bits (D0
–
D15). Bit 0 refers to the
D0 bit in the read-word protocol. The MAX1645B com-
plies with Level 2 Smart Battery Charger Specification
Revision 1.0; therefore, the ChargerSpecInfo() command
returns 0x09.
ChargerMode()
The ChargerMode() command uses the write-word
protocol (Figure 3a). The command code for
ChargerMode() is 0x12 (0b00010010). Table 2 lists the
functions of the data bits (D0
–
D15). Bit 0 refers to the
D0 bit in the write-word protocol.
To charge a battery that has a thermistor impedance in
the HOT range (i.e., THERMISTOR_HOT = 1 and
THERMISTOR_UR = 0), the host must use the
ChargerMode() command to clear HOT_STOP after the
battery is inserted. The HOT_STOP bit returns to its
default power-up condition (1) whenever the battery is
removed.
ChargerStatus()
The ChargerStatus() command uses the read-word
protocol (Figure 3b). The command code for
ChargerStatus() is 0x13 (0b00010011). Table 3
describes the functions of the data bits (D0
–
D15). Bit 0
refers to the D0 bit in the read-word protocol.
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相关代理商/技术参数
参数描述
MAX1645BEEI 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX1645BEEI+ 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX1645BEEI+T 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX1645BEEI-T 功能描述:电池管理 Advanced Chemistry-Independent Level 2 Battery Charger with Input Current Limiting RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX1645BEVKIT 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT/EVALUATION SYSTEM FOR THE MAX1645B - Bulk
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