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MAX6916 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6916 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 28 page General Description The MAX6916 provides all the features of a real-time clock (RTC) plus a microprocessor supervisory circuit, NV RAM controller, and backup-battery monitor func- tion. In addition, 96 x 8 bits of static RAM are available for scratchpad storage. The MAX6916 communicates with a microprocessor through an SPI™-bus-compati- ble serial interface. The real-time clock/calendar provides seconds, min- utes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap years through 2099. The clock operates in either 24hr or 12hr format with an AM/PM indicator. A time/date-programmable alarm function is provided with an open-drain, active-low alarm output. The microprocessor supervisory circuit features an open-drain, active-low reset available in three different reset thresholds. A manual reset input and a watchdog function are included as well. The NV RAM controller provides power for external SRAM from a backup battery plus chip-enable gating. The back- up battery also provides data retention of the on-board 96 x 8 bits of RAM. An open-drain, active-low, battery-on sig- nal alerts the system when operating from a battery. The battery-test circuitry periodically tests the backup battery for a low-battery condition. An optional external resistor network selects different battery thresholds. A freshness seal prevents battery drain until the first VCC power-up. The MAX6916 has a crystal-fail-detect circuit and a data-valid bit. The MAX6916 is available in a 20-pin QSOP package and is guaranteed to operate over the -40°C to +85°C extended temperature range. Applications Point-of-Sale Equipment Programmable Logic Controllers Intelligent Instruments Fax Machines Digital Thermostats Industrial Controls Features o Real-Time Clock Counts Seconds, Minutes, Hours, Date, Month, Day of Week, and Year with Leap-Year Compensation Through 2099 o 4MHz SPI-Bus-Compatible Interface at 5V, 2MHz at 3V, and 3.3V o SPI Interface Supports Modes 1 and 3 (0, 1 and 1, 1) o 96 x 8 Bits of RAM for Scratchpad Data Storage o Uses Standard 32.768kHz, 6pF Load, Watch Crystal o Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or RAM o Battery Monitor and Low-Battery Warning Output Internal Default for Lithium Backup-Battery Testing Pins Available for Other Backup-Battery Testing Configurations o Dual Power-Supply Pins for Primary and Backup Power o Battery-On Output o NV RAM Controller Chip-Enable Gating (Control of CE with Reset and Power Valid) VOUT for SRAM Power o µP Supervisor with Watchdog Input o Programmable Time/Date Alarm Output o Data Valid Bit (Loss of All Voltage Alerts User of Corrupt Data) o Crystal-Fail Detect o Small 20-Pin, QSOP Surface-Mount Package SPI-Compatible RTC with Microprocessor Supervisor, Alarm, and NV RAM Controller ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-3694; Rev 0; 10/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN- PACKAGE PKG CODE MAX6916EO30+ -40°C to +85°C 20 QSOP E20-2 MAX6916EO33+ -40°C to +85°C 20 QSOP E20-2 MAX6916EO50+ -40°C to +85°C 20 QSOP E20-2 Pin Configuration and Selector Guide appear at end of data sheet. SPI is a trademark of Motorola, Inc. +Denotes lead-free package. |
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