MAX1535A データシートの表示（PDF） - Maxim Integrated

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MAX1535A

Highly Integrated Level 2 Smbus Battery Charger

Maxim Integrated 

Highly Integrated Level 2 SMBus

Battery Charger

and STOP conditions. Data is transmitted in 8-bit bytes

and is sampled on the rising edge of SCL. Nine clock

cycles are required to transfer each byte in or out of the

MAX1535A since either the master or the slave

acknowledges the receipt of the correct byte during the

ninth clock. The MAX1535A supports the charger com-

mands as described in Tables 2–9.

Battery-Charger Commands

The MAX1535A supports seven battery charger com-

mands that use either Write-Word or Read-Word proto-

cols, as summarized in Table 2.

ChargerSpec()

The ChargerSpec() command uses the Read-Word pro-

tocol (Figure 3). The command code for ChargerSpec() is

0x11(0b00010001). Table 3 lists the functions of the data

bits (D0–D15). Bit 0 refers to the D0 bit in the Read-Word

protocol. The MAX1535A complies with Level 2 Smart-

Battery Charger Specification Revision 1.1; therefore, the

ChargerSpec() command returns 0x0002.

ChargerMode()

The ChargerMode() command uses the Write-Word

protocol (Figure 3). The command code for

ChargerMode() is 0x12 (0b00010010). Table 4 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 3). The command code for

ChargerStatus() is 0x13 (0b00010011). Table 5

describes the functions of the data bits (D0–D15). Bit 0

refers to the D0 bit in the Read-Word protocol.

The ChargerStatus() command returns information

about thermistor impedance and the MAX1535A’s inter-

nal state. The latched bits, THERMISTOR_HOT and

ALARM_INHIBITED, are cleared whenever BATTERY_

PRESENT = 0 or ChargerMode() is written with

POR_RESET = 1. The ALARM_INHIBITED status bit can

also be cleared by writing a new charge current or

charge voltage.

ChargeCurrent() (POR: 0x0080)

The ChargeCurrent() command uses the Write-Word

protocol (Figure 3). The command code for

ChargeCurrent() is 0x14 (0b00010100). The 16-bit

binary number formed by D15–D0 represents the

charge-current set point in milliamps. However, the res-

olution of the MAX1535A is 128mA in setting the charge

current; bits D0–D6 are ignored as shown in Table 6.

The D13, D14, and D15 bits are also ignored. Figure 6

shows the mapping between the charge-current set

point and the ChargeCurrent() code. All codes request-

ing charge current above 8.064A result in a current

overrange, limiting the charging current to 8.064A. All

codes requesting charge current between 1mA to

128mA result in a current setting of 128mA. A 10mΩ

current-sense resistor (R2 in Figure 1) is required to

achieve the correct code/current scaling.

Table 2. Battery-Charger Command Summary

COMMAND

0x11

0x12

0x13

0x14

0x15

0x16

0x3F

0xFE

0xFF

COMMAND NAME

ChargerSpec()

ChargerMode()

ChargerStatus()

ChargeCurrent()

ChargeVoltage()

AlarmWarning()

InputCurrent()

DeviceID()

ManufacturerID()

READ/WRITE

Read Only

Write Only

Read Only

Write Only

Write Only

Write Only

Write Only

Read Only

Read Only

DESCRIPTION

Charger specification

Charger mode

Charger status

Charge-current setting

Charge-voltage setting

Alarm warning

Input current-limit setting

Device ID

Manufacturer ID

POR STATE

0x0002

N/A

N/A

0x0080

0x4B00

N/A

0x0080

0x0006

0x004D

STATUS BITS AFFECTED

N/A

CHARGE_INHIBITED,

ALARM_INHIBITED,

THERMISTOR_HOT

N/A

CURRENT_NOT_REG,

CURRENT_OR

VOLTAGE_NOT_REG,

VOLTAGE_OR

N/A

CURRENT_NOT_REG

N/A

N/A

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