VR4102 datasheet(65/701 Pages) NEC

65 / 701 page

CHAPTER 2 PIN FUNCTIONS

2.2.2 Clock Interface Signals

These signals are used to supply clocks. Table 2-2 lists functions of these signals.

Table 2-2. Clock Interface Signals

Signal

I/O

Description of function

RTCX1

This is the 32.768-kHz oscillator’s input pin. It is connected to one side of a crystal resonator.

RTCX2

This is the 32.768-kHz oscillator’s output pin. It is connected to one side of a crystal resonator.

CLKX1

This is the 18.432-MHz oscillator’s input pin. It is connected to one side of a crystal resonator.

CLKX2

This is the 18.432-MHz oscillator’s output pin. It is connected to one side of a crystal resonator.

FIRCLK

This the 48-MHz clock input pin. Fix this at high level when FIR is not used.

2.2.3 Battery Monitor Interface Signals

These signals indicate when an external agent is able to provide enough power for system operations. Table 2-3

describes the functions of these signals.

Table 2-3. Battery Monitor Interface Signals

Signal

I/O

Description of function

BATTINH/

BATTINT#

This function differs depending on how the MPOWER pin is set.

BATTINH function

This is an interrupt signal that is output when remaining power is low while battery is ON. The

external agent checks the remaining battery power and asserts the signal at this pin if the supplied

voltage is sufficient for current operations.

1 : Battery OK

0 : Battery low

BATTINT# function

This is an interrupt signal that is output when remaining power is low during normal operations. The

external agent checks the remaining battery power and asserts the signal at this pin if voltage

sufficient for operations cannot be supplied.

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