ISL1218IBZ Intersil, ISL1218IBZ Datasheet

Page 1

... PART TEMP. NUMBER PART V RANGE DD (Note) MARKING RANGE ISL1218IBZ 1218IBZ 2.7V to - SOIC 5.5V ISL1218IBZ-T 1218IBZ 2.7V to - SOIC 5.5V ISL1218IUZ 1218Z 2.7V to - MSOP 5.5V ISL1218IUZ-T 1218Z 2.7V to - MSOP 5.5V NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets ...

Page 2

Block Diagram SDA SDA BUFFER SCL SCL BUFFER X1 CRYSTAL OSCILLATOR TRIP V BAT Pin Descriptions PIN NUMBER SYMBOL 1 X1 The X1 pin is the input of an inverting amplifier and is intended to be ...

Page 3

Absolute Maximum Ratings Voltage SCL, SDA, and IRQ/F DD BAT (respect to ground ...

Page 4

Serial Interface Specifications SYMBOL PARAMETER Hysteresis SDA and SCL Input Buffer Hysteresis V SDA Output Buffer LOW Voltage, OL Sinking 3mA Cpin SDA and SCL Pin Capacitance f SCL Frequency SCL t Pulse Width Suppression Time at SDA IN and ...

Page 5

SDA vs SCL Timing SCL t SU:STA t HD:STA SDA (INPUT TIMING) SDA (OUTPUT TIMING) Symbol Table WAVEFORM INPUTS Must be steady May change from LOW to HIGH May change from HIGH to LOW Don’t Care: Changes Allowed N/A 5 ...

Page 6

Typical Performance Curves 1E-6 900E-9 800E-9 700E-9 600E-9 500E-9 400E-9 300E-9 200E-9 100E-9 000E+0 1.5 2.0 2.5 3.0 3.5 4.0 V (V) BAT FIGURE BAT 2.4E-06 2.2E- 2.0E-06 1.8E-06 1.6E- ...

Page 7

... A 0.1µF capacitor is recommended on the V Functional Description Power Control Operation The power control circuit accepts a V Many types of batteries can be used with Intersil RTC products. For example, 3.0V or 3.6V Lithium batteries are appropriate, and battery sizes are available that can power X1 X2 ...

Page 8

ISL1218 for years. Another option is to use a Super Cap for applications where month. See the Applications Section for more information. Normal Mode ( Battery Backup Mode DD (V ...

Page 9

Accuracy of the Real Time Clock The accuracy of the Real Time Clock depends on the frequency of the quartz crystal that is used as the time base for the RTC. Since the resonant frequency of a crystal is temperature ...

Page 10

Write capability is allowable into the RTC registers (00h to 06h) only when the WRTC bit (bit 4 of address 07h) is set to “1”. A multi-byte read or write operation is limited to one section per operation. Access to ...

Page 11

Real Time Clock Registers Addresses [00h to 06h] RTC REGISTERS (SC, MN, HR, DT, MO, YR, DW) These registers depict BCD representations of the time. As such, SC (Seconds) and MN (Minutes) range from 0 to 59, HR (Hour) can ...

Page 12

NOTE: Writing to register 08h has restrictions byte writes to register 08h are allowed, only page writes beginning with register 07h >V , then a byte write to register 08h IS DD BAT allowed, as well ...

Page 13

The effective on-chip series load capacitance, C ranges from 4.5pF to 20.25pF with a mid-scale value of 12.5pF (default changed via two digitally LOAD controlled capacitors, C and C , connected from the and X2 ...

Page 14

Below are examples of both Single Event and periodic Interrupt Mode alarms. Example 1 – Alarm set with single interrupt (IM = ”0”) A single alarm will occur on January 1 at 11:30am. A. Set Alarm registers as follows: BIT ...

Page 15

The ISL1218 responds with an ACK after recognition of a START condition followed by a valid Identification Byte, and once again after successful receipt of an Address Byte. The SCL SDA START FIGURE 12. VALID DATA CHANGES, START, AND STOP ...

Page 16

Device Addressing Following a start condition, the master must output a Slave Address Byte. The 7 MSBs are the device identifier. These bits are “1101111”. Slave bits “1101” access the register. Slave bits “111” specify the device select bits. The ...

Page 17

Application Section Oscillator Crystal Requirements The ISL1218 uses a standard 32.768kHz crystal. Either through hole or surface mount crystals can be used. Table 6 lists some recommended surface mount crystals and the parameters of each. This list is not exhaustive ...

Page 18

A system to implement temperature compensation would consist of the ISL1218, a temperature sensor, and a microcontroller. These devices may already be in the system so the function will just be a matter of implementing software and performing some calculations. ...

Page 19

For a robust design, a margin of 30% should be included to cover supply current and capacitance tolerances over the results of the calculations. Even more margin should be included if periods of very warm temperature operation are ...

Page 20

Mini Small Outline Plastic Packages (MSOP -B- INDEX 1 2 0.20 (0.008) AREA TOP VIEW 0.25 (0.010) GAUGE PLANE SEATING PLANE - 0.10 (0.004) b -H- - 0.20 (0.008) SIDE VIEW 0.20 ...

Page 21

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...