MAX17435 查看數據表（PDF） - Maxim Integrated
零件编号
产品描述 (功能)
生产厂家
MAX17435 Datasheet PDF : 27 Pages
| |||
High-Frequency,
Low-Cost SMBus Chargers
A
B
C
D
EF
G
tLOW tHIGH
SMBCLK
H
I
J
K
SMBDATA
tSU:STA tHD:STA
tSU:DAT
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
tHD:DAT
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
tSU:DAT
tSU:STO tBUF
I = ACKNOWLEDGE CLOCK PULSE
J = STOP CONDITION
K = NEW START CONDITION
Figure 5. SMBus Read Timing
Battery Charger Commands
The MAX17435/MAX17535 support four battery-charger
commands that use either write-word or read-word
protocols as summarized in Table 3. ManufacturerID()
and DeviceID() can be used to identify the
MAX17435/MAX17535. On the MAX17435/MAX17535,
ManufacturerID() always returns 0x004D and DeviceID()
always returns 0x0008.
Setting Charge Voltage
To set the output voltage, use the SMBus to write a
16-bit ChargeVoltage() command using the data format
listed in Table 4. The ChargeVoltage() command uses
the write-word and read-word protocols (see Figure
3). The command code for ChargeVoltage() is 0x15
(0b00010101). The MAX17435/MAX17535 provide
a charge-voltage range of 4.095V to 19.200V, with
16mV resolution. Set ChargeVoltage() below 4.095V to
terminate charging. Upon reset, the ChargeVoltage()
and ChargeCurrent() values are cleared and the charger
remains off until both the ChargeVoltage() and the
ChargeCurrent() command are sent. Both DHI and DLO
remain low until the charger is restarted.
Setting Charge Current
To set the charge current, use the SMBus to write a 16-bit
ChargeCurrent() command using the data format listed in
Table 5. The ChargeCurrent() command uses the write-word
and read-word protocols (see Figure 3). The command
code for ChargeCurrent() is 0x14 (0b00010100). When
RS2 = 10mI, the MAX17435/MAX17535 provide a charge-
current range of 128mA to 8.064A, with 128mA resolution.
If a sense resistor other than 10mI is used, the current
limit must be scaled by RS/10mI, where RS is the sense
resistor value used on the circuit. Set ChargeCurrent() to
0 to terminate charging. Upon reset, the ChargeVoltage()
and ChargeCurrent() values are cleared and the charger
remains off until both the ChargeVoltage() and the
ChargeCurrent() command are sent. Both DHI and DLO
remain low until the charger is restarted.
The MAX17435/MAX17535 include a fault limiter for
low-battery conditions. If the battery voltage is less than
3V, the charge current is temporarily set to 128mA. The
ChargeCurrent() register is preserved and becomes
active again when the battery voltage is higher than 3V.
This function effectively provides a foldback current limit
that protects the charger during short circuit and overload.
Table 3. Battery Charger Command Summary
COMMAND
0x14
COMMAND NAME
ChargeCurrent()
READ/WRITE
Read and write
0x15
ChargeVoltage() Read and write
0x3D
0x3E
Relearn Voltage
IINPVoltage()
Read and write
Read only
0x3F
InputCurrent()
Read and write
0xFE
ManufacturerID()
Read only
0xFF
DeviceID()
Read only
Note: ‘x’ means the data is sent to the analog block.
DESCRIPTION
6-bit charge-current setting, readback
(3’b0, 6’bx, 7’b0)
11-bit charge-voltage setting, readback
(1’b0, 11’bx, 4’b0)
11-bit relearn voltage set and 1-bit enable/status
Digital readback of IINP voltage
6-bit input-current setting readback
(3’b0, 6’bx, 7’b0)
Manufacturer ID
Device ID
POR STATE
0x0000
0x0000
0x4B00
NA
0x1000
0x004D
0x0008
18 �������������������������������������������������������������������������������������
Share Link: 