công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
ISL12058 bảng dữ liệu(PDF) 8 Page - Intersil Corporation |
|
ISL12058 bảng dữ liệu(HTML) 8 Page - Intersil Corporation |
8 / 19 page 8 FN6756.0 June 15, 2009 IRQ/FOUT (Interrupt Output/Frequency Output) This dual function pin can be used as an interrupt or frequency output pin. The IRQ/FOUT mode is selected via the IRQE bit of the control register (address 08h). The IRQ/FOUT is an open drain output and requires the use of a pull-up resistor, and it can accept a pull-up voltage up to 5.5V. This pin has a default output of 32.768kHz at power-up. • Interrupt Mode. The pin provides an interrupt signal output. This signal notifies a host processor that an alarm has occurred and requests action. • Frequency Output Mode. The pin outputs a clock signal which is related to the crystal frequency. The frequency output is user selectable and enabled via the I2C bus. Serial Clock (SCL) The SCL input is used to clock all serial data into and out of the device. The input buffer on this pin is always active (not gated). The SCL pin can accept a logic high voltage up to 5.5V. Serial Data (SDA) SDA is a bi-directional pin used to transfer data into and out of the device. It has an open drain output and may be ORed with other open drain or open collector outputs. The input buffer is always active (not gated) in normal mode. An open drain output requires the use of a pull-up resistor, and it can accept a pull-up voltage up to 5.5V. The output circuitry controls the fall time of the output signal with the use of a slope controlled pull-down. The circuit is designed for 400kHz I2C interface speeds. NOTE: Parts will work with SDA pull-up voltage above the VPULLUP limit but the tAA and tFin the I 2C parameters are not guaranteed. VDD, GND Chip power supply and ground pins. The device will have full operation with a power supply from 1.8V to 3.6V, and timekeeping function with a power supply from 1.4V to 3.6V. A 0.1µF decoupling capacitor is recommended on the VDD pin to ground. NC (No Connection) The NC pin is not connected to the die. The pin can be connected to GND or left floating. Functional Description Real Time Clock Operation The Real Time Clock (RTC) uses an external 32.768kHz quartz crystal to maintain an accurate internal representation of second, minute, hour, day of week, date, month, and year. The RTC also has leap-year correction. The RTC also corrects for months having fewer than 31 days and has a bit that controls 24 hour or AM/PM format. When the ISL12058 powers up after the loss of VDD, the clock will not begin incrementing until at least one byte is written to the clock register. 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 dependent, the RTC performance will also be dependent upon temperature. The frequency deviation of the crystal is a function of the turnover temperature of the crystal from the crystal’s nominal frequency. For example, a ~20ppm frequency deviation translates into an accuracy of ~1 minute per month. These parameters are available from the crystal manufacturer. Alarm Interrupt The alarm interrupt mode is enabled by setting IRQE bit to ‘1’ with Alarm1 enables by setting ALM1E to ‘1’. The standard alarm allows for alarms of time, date, day of the week, month, and year. When a time alarm occurs, the IRQ/FOUT pin will be pulled low and the alarm interrupt bit (A1F) will be set to “1”. NOTE: The A1F bit can be reset by the user or cleared automatically using the Auto Reset mode (see ARST bit, address 07h). Alarm2 does not have hardware interrupt function. Frequency Output Mode The ISL12058 has the option to provide a frequency output signal using the IRQ/FOUT pin. The frequency output mode is set by using the FO bits to select 4 possible output frequency values from 1Hz to 32.768kHz. The IRQE bit must be set to ‘0’ for frequency output. I2C Serial Interface The ISL12058 has an I2C serial bus interface that provides access to the real time clock registers, control and status registers and the alarm registers. The I2C serial interface is compatible with other industry I2C serial bus protocols using a bi-directional data signal (SDA) and a clock signal (SCL). Register Descriptions The registers are accessible following a slave byte of “1101111x” and reads or writes to addresses [00h:1Fh]. The defined addresses and default values are described in Table 1. Address 15h to 1Fh are not used. Reads or writes to 15h to 1Fh will not affect operation of the device but should be avoided. For Page Write and Page Read operation, the address will wrap around from address 1Fh to 00h. REGISTER ACCESS The contents of the registers can be modified by performing a byte or a page write operation directly to any register address. The registers are divided into 3 sections. These are: 1. Real Time Clock (7 bytes): Address 00h to 06h. 2. Control and Status (2 bytes): Address 07h to 08h. 3. Alarm1 and Alarm2 (9 bytes): Address 0Ch to 14h. There are no addresses above 1Fh. ISL12058 |
Số phần tương tự - ISL12058 |
|
Mô tả tương tự - ISL12058 |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |