V3025 EMMICRO [EM Microelectronic - MARIN SA], V3025 Datasheet
V3025
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V3025 Summary of contents
Page 1
... Multiplexing of address and data is handled by the input line A /D. There are no busy flags in the V3025, internal time update cycles are invisible to the user's software. Time data can be read from the V3025 hour data formats. An external signal puts the V3025 in standby mode ...
Page 2
... V ≤ 5.5 V (note 3) sta DD addr. 10 hex = 00 hex sta +25°C, first year 3V, 10 pulses BAT DD switching between 70ms ) and all other I/O pads fixed V3025 Symbol Min Typ Max T -40 + BAT V 2.0 5.0 SUP dv/dt 100 ...
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... 50pF ACC LOAD ADW / /Dt in ns; where C (external parasitic capacitance EXT 3 V3025 Min Typ Max = 100mA 20mA 24 40 3.00 3.21 3.45 2.98 3.08 3.18 14 100 8 60 Min Typ Max 50 50 100 ...
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... R Typical V Current vs. Temperature DD Typical V Current vs. Temperature BAT Typical Frequency on IRQ Copyright © 2004, EM Microelectronic-Marin SA 4 www.emmicroelectronic.com V3025 Fig. 3 Fig. 4 Fig. 5 ...
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... T = the temperature of interest in ° the turnover temperature (25 ± 5° determine the clock error (accuracy given temperature, add the frequency tolerance at 25°C to the value obtained from the formula above. 5 www.emmicroelectronic.com V3025 Fig. 6 Fig. 7 Fig. 8 ...
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... R Timing Waveforms Read Timing for Intel ( RD and WR Pulse) and Motorola ( pin tied to CS and Copyright © 2004, EM Microelectronic-Marin SA 6 www.emmicroelectronic.com V3025 Fig. 9a ...
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... R Intel Interface Write Timing Write Read Copyright © 2004, EM Microelectronic-Marin SA 7 www.emmicroelectronic.com V3025 Fig. 9b Fig. 9c Fig. 9d ...
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... R Motorola Interface Motorola Write Write Read Copyright © 2004, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com V3025 Fig. 9e Fig. 9f Fig. 9g ...
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... R General Block Diagram Copyright © 2004, EM Microelectronic-Marin SA 9 www.emmicroelectronic.com V3025 Fig. 10 ...
Page 10
... Copyright © 2004, EM Microelectronic-Marin SA Initialisation When power is first applied to the V3025 all registers have a random value. To initialise the V3025, software must first write the I initialisation bit (addr. 2 bit 4) and then a 0. This sets the I Frequency Tuning bit and clears all other status bits. ...
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... AM/PM bit. A set AM/PM bit indicates PM. In the 24 hour time data format the bit will always be zero. Note 2 : The alarm hours, addr. 33 hex, must always be rewritten after a change between 12 and 24 hour modes. 11 V3025 Parameter Range Data Space status 0 status 1 status 2 ...
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... These parameters have the ranges indicated in Table 10. The V3025 may be programmed for hour time format (see section "12/24 Data Format"). If a parameter is found to be out of range, it will be cleared when the units value on its being next incremented is equal to or greater than 9 eg ...
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... Thus it is possible to achieve a repeat feature where an alarm occurs every programmed number of seconds, or seconds and minutes, or seconds, minutes and hours. The V3025 pulls the open drain IRQ line active low during standby when an alarm interrupt occurs. If the 12/24 hour mode is changed then the alarm hours must be re-initialised ...
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... Note that a 1 ppm error will result second difference after 11.5 days minute difference after 694 days ! The trimming range of the V3025 is from 0 to 251 ppm. The 251 ppm correction is obtained by writing 255 (FFhex) into the digital trimming register. ...
Page 15
... How to Determine the Digital Trimming Value The value to write into the digital trimming register has to be determined by the following procedure: 1. Initialise the V3025 by writing a 1 and then a 0 into the "Initialisation Bit" of the status register 2 (addr. 02 hex, bit 4). This activates the frequency tuning mode in status register 0 (addr ...
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... Typical Operating Configuration Process Application Controller Solenoid valve Typical Applications V3025 Interfaced with Intel CPU ( RD and WR pulse) Copyright © 2004, EM Microelectronic-Marin SA • The formula in Fig used by software to continually update the digital trimming register and so compensate the V3025 for the ambient temperature. ...
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... R V3025 Interfaced with Motorola CPU ( pin tied and Ordering and Package Information Dimensions of 28-pin SOIC Package Ordering Information When ordering, please specify the complete part number. Part Number Package V3025SO28B 28-pin SOIC V3025SO28A 28-pin SOIC EM Microelectronic-Marin SA cannot assume responsibility for use of any circuitry described other than circuitry entirely embodied Microelectronic-Marin SA product ...