V3020TP8B datasheet(14/17 Pages) EMMICRO

Part #	V3020TP8B

Description	Ultra Low Power 1-Bit 32 kHz RTC

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Manufacturer	EMMICRO [EM Microelectronic - MARIN SA]

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V3020

14

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Test Modes

Addr. 0

bit 3

Addr. 0

bit 2

Function

0

Normal operation

0

1

All time keeping accelerated by 32

1

0

Parallel increment of all time data

at 1 Hz with no carry over

1

Parallel increment of all time data

at 32 Hz with no carry over

Table 8

An external signal generator can be used to drive the

divider chain of the V3020. Fig. 13a and 13b show how to

connect the signal generator.

The speed can be

increased by increasing the signal generator frequency to

a maximum of 128 kHz. An external signal generator and

test modes can be combined.

To leave test both test bits (address 0, bits 2 and 3) must

be cleared by software. Test corrupts the current time

and date and so the time and date should be reloaded

after a test session.

Signal Generator Connection

Fig. 13a

Note

: The peak value of the signal provided by the signal

generator should not exceed 1.5 V on XO.

Fig. 13b

Note

: The peak value of the signal provided by the signal

generator should not exceed 1.5 V on XO.

Crystal Layout

In order to ensure proper oscillator operation we

recommend the following standard practices:

- Keep traces as short as possible

- Use a guard ring around the crystal

Fig. 14 shows the recommended layout.

Oscillator Layout

Fig. 14

Access Considerations

The section "Communication Cycles" describes the serial

data sequences necessary to complete a communication

cycle. In common with all serial peripherals, the serial

data sequences are not re-entrant, thus a high priority

interrupt, or another software task, should not attempt to

access the V3020 if it is already in the middle of a cycle.

A semaphore (software flag) on access would allow the

V3020 to be shared with other software tasks or interrupt

routines.

There is no time limit on the duration of a

communication cycle and thus interrupt routines (which do

not use the V3020) can be fully executed in mid cycles

without any consequences for the V3020.

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V3020TP8B Datasheet(PDF) 14 Page - EM Microelectronic - MARIN SA

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