LTC3567 datasheet(18/28 Pages) LINER

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LTC3567

3567f

OPERATION

Table 2. I2C Serial Port Mapping (Defaults 0xFF00 in Reset State or if DVCC = 0V)

Reserved for Internal

Use

Switching Regulator

Voltage (See Table 4)

Disable

Battery

Charger

Buck-Boost

Regulator

Mode (See

Table 5)

Reserved for Internal

Use

Enable

Buck-Boost

Regulator

Input Current Limit

(See Table 3)

the total of one address byte and two data bytes. Each

data byte is transferred to an internal holding latch upon

the return of an Acknowledge. After both data bytes have

been transferred to the LTC3567, the master may terminate

the communication with a Stop condition. Alternatively, a

Repeat-Start condition can be initiated by the master and

another chip on the I2C bus can be addressed. This cycle

can continue indeﬁnitely and the LTC3567 will remember

the last input of valid data that it received. Once all chips on

the bus have been addressed and sent valid data, a global

Stop condition can be sent and the LTC3567 will update its

command latch with the data that it had received.

In certain circumstances the data on the I2C bus may

become corrupted. In these cases the LTC3567 responds

appropriately by preserving only the last set of complete

data that it has received. For example, assume the LTC3567

has been successfully addressed and is receiving data

when a Stop condition mistakenly occurs. The LTC3567

will ignore this Stop condition and will not respond until

a new Start condition, correct address, new set of data

and Stop condition are transmitted.

Likewise, with only one exception, if the LTC3567 was

previously addressed and sent valid data but not updated

with a Stop, it will respond to any Stop that appears on

the bus, independent of the number of Repeat-Starts that

have occurred. If a Repeat-Start is given and the LTC3567

successfully acknowledges its address and ﬁrst byte, it

will not respond to a Stop until both bytes of the new data

have been received and acknowledged.

Disabling the I2C Port

The I2C serial port can be disabled by grounding the DVCC

pin. In this mode, control automatically passes to the

individual logic input pins EN1 and CHRGEN. However,

with the I2C port disabled, the programmable buck-boost

switching regulator defaults to a ﬁxed servo voltage of 0.8V

in PWM mode, and the USB input current limit defaults to

1x mode (100mA limit). By default the battery charger will

be enabled and the buck-boost will be disabled.

Table 3. USB Current Limit Settings

USB SETTING

1x Mode (USB 100mA Limit)

10x Mode (Wall 1A Limit)

Suspend

5x Mode (USB 500mA Limit)

Table 4. Buck-Boost Regulator Servo Voltage

SWITCHING REGULATOR

SERVO VOLTAGE

0.425V

0.450V

0.475V

0.500V

0.525V

0.550V

0.575V

0.600V

0.625V

0.650V

0.675V

0.700V

0.725V

0.750V

0.775V

0.800V

Table 5. Buck-Boost Switching Regulator Modes

SWITCHING REGULATOR MODE

PWM Mode

Burst Mode Operation

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