DS1510Y

DS1510Y Datasheet

DS1500/DS1510 Y2KC Watchdog RTC with NV Control

Part	Datasheet
DS1510Y	DS1510Y (pdf)

Related Parts	Information
DS1510W	DS1510W

PDF Datasheet Preview
DS1500/DS1510 Y2KC Watchdog RTC with NV Control BCD coded century, year, month, date, day, hours, minutes, and seconds with automatic leap year compensation valid up to the year 2100 Programmable Watchdog Timer and RTC Alarm Century register Y2K Compliant RTC Automatic battery backup and write protection to external SRAM or +5V operation Precision Power-On Reset Power control circuitry supports system power on from date/day/time alarm or key closure 256 bytes user NV RAM Auxiliary battery input Accuracy of DS1510 is better than ±1 minute/month at 25°C Day of week/Date alarm register Battery voltage level indicator flags Available as chip or standalone module with embedded battery and crystal Optional industrial temperature range -40°C to +85°C DS1500 only PIN ASSIGNMENT ORDERING INFORMATION DS1500XXX blank commercial temp range N industrial temp range blank 32-pin DIP E 32-pin TSOP Y 5V operation W 3.3V operation DS1510X DIP Module Y 5V W 3.3V Package Dimension Information can be found at: 1 of 25 110100 PIN DESCRIPTION VCCI A0-A4 - Supply Voltage - Address Inputs DQ0-DQ7 - Data I/O - RTC Chip Select Input - RTC Output Enable Input - RTC Write Enable Input - Interrupt Output open drain - Power-On Output open drain - Reset Output open drain SQW VBAT VBAUX VCCO X1, X2 GND DS1500/DS1510 - Kickstart Input - Square wave output - Backup Battery Supply - Auxiliary Battery Supply - RAM Chip Enable Input - RAM Chip Enable Output - RAM Power Supply Output - kHz Crystal pins - Ground The DS1500/DS1510 is a full function, year 2000 compliant, real-time clock/calendar RTC with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on board non-volatile static RAM, NV control for backing up an external SRAM, and a kHz output. User access to all registers within the DS1500/DS1510 is accomplished with a bytewide interface as shown in Figure The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically. The RTC registers are double buffered into an internal and external set. The user has direct access to the external set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow the user to access static data. When the crystal oscillator is turned on, the internal set of registers are continuously updated this occurs regardless of external register settings to guarantee that accurate RTC information is always maintained. The DS1500/DS1510 contains its own power fail circuitry which automatically deselects the device when the VCCI supply falls below a power fail trip point. This feature provides a high degree of data security during unpredictable system operation brought on by low VCCI levels. An external SRAM can be made nonvolatile by using the VCCO and CEO pins. Nonvolatile control of the external SRAM is analogous to that of the real-time clock registers. When VCCI slews down during a power fail, CEO is driven to an inactive level regardless of CEI This write protection occurs when VCCI is less than the power fails trip point. The DS1500/DS1510 has interrupt IRQ , power control PWR , and reset RST outputs which can be used to control CPU activity. The IRQ interrupt or RST outputs can be invoked as the result of a time of day alarm, CPU watchdog alarm, or a kick start signal. The DS1500/1511 power control circuitry allows the system to be powered on via an external stimulus, such as a keyboard or by a time and date wake-up alarm. The PWR output pin can be triggered by one or either of these events, and can be used to turn on an external power supply. The PWR pin is under software control, so that when a task is complete, the system power can then be shut down. The DS1500/DS1510 power-on reset can be used to detect a system power down or failure and hold the CPU in a safe reset state until normal power returns and stabilizes the RST output is used for this function. The DS1500 is a clock/calendar chip with the features described above. An external crystal and battery are the only components required to maintain time-of-day and memory status in the absence of power. The DS1510 incorporates the DS1500 chip, a kHz crystal, and a lithium battery in a complete, self-contained timekeeping module. The entire unit is designed by Dallas Semiconductor to provide a minimum of 10 years of timekeeping and data retention in the absence of VCCI is guaranteed. 2 of 25 DS1500/DS1510 BLOCK DIAGRAM Figure 1 DS1500/DS1510 VCCI DS1500/DS1510 RTC OPERATING MODES Table 1 VCCI > VPF CS OE WE DQ0-DQ7 A0-A4 VIH X High-Z MODE Deselect VIL X VIL Write

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DS1500/DS1510 Y2KC Watchdog RTC with NV Control

BCD coded century, year, month, date, day, hours, minutes, and seconds with automatic leap year compensation valid up to the year 2100 Programmable Watchdog Timer and RTC Alarm Century register Y2K Compliant RTC Automatic battery backup and write protection to external SRAM or +5V operation Precision Power-On Reset Power control circuitry supports system power on from date/day/time alarm or key closure 256 bytes user NV RAM Auxiliary battery input Accuracy of DS1510 is better than ±1 minute/month at 25°C Day of week/Date alarm register Battery voltage level indicator flags Available as chip or standalone module with embedded battery and crystal Optional industrial temperature range -40°C to +85°C DS1500 only

PIN ASSIGNMENT
ORDERING INFORMATION

DS1500XXX blank commercial temp range N industrial temp range
blank 32-pin DIP E 32-pin TSOP

Y 5V operation W 3.3V operation

DS1510X DIP Module

Y 5V W 3.3V

Package Dimension Information can be found at:
1 of 25
110100

PIN DESCRIPTION

VCCI A0-A4
- Supply Voltage - Address Inputs

DQ0-DQ7 - Data I/O
- RTC Chip Select Input
- RTC Output Enable Input
- RTC Write Enable Input
- Interrupt Output open drain
- Power-On Output open drain
- Reset Output open drain

SQW VBAT VBAUX

VCCO X1, X2 GND

DS1500/DS1510
- Kickstart Input - Square wave output - Backup Battery Supply - Auxiliary Battery Supply - RAM Chip Enable Input - RAM Chip Enable Output - RAM Power Supply Output - kHz Crystal pins - Ground

The DS1500/DS1510 is a full function, year 2000 compliant, real-time clock/calendar RTC with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on board non-volatile static RAM, NV control for backing up an external SRAM, and a kHz output. User access to all registers within the DS1500/DS1510 is accomplished with a bytewide interface as shown in Figure The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically.

The RTC registers are double buffered into an internal and external set. The user has direct access to the external set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow the user to access static data. When the crystal oscillator is turned on, the internal set of registers are continuously updated this occurs regardless of external register settings to guarantee that accurate RTC information is always maintained.

The DS1500/DS1510 contains its own power fail circuitry which automatically deselects the device when the VCCI supply falls below a power fail trip point. This feature provides a high degree of data security during unpredictable system operation brought on by low VCCI levels. An external SRAM can be made nonvolatile by using the VCCO and CEO pins. Nonvolatile control of the external SRAM is analogous to that of the real-time clock registers. When VCCI slews down during a power fail, CEO is driven to an inactive level regardless of CEI This write protection occurs when VCCI is less than the power fails trip point.

The DS1500/DS1510 has interrupt IRQ , power control PWR , and reset RST outputs which can be
used to control CPU activity. The IRQ interrupt or RST outputs can be invoked as the result of a time of day alarm, CPU watchdog alarm, or a kick start signal. The DS1500/1511 power control circuitry allows the system to be powered on via an external stimulus, such as a keyboard or by a time and date wake-up alarm. The PWR output pin can be triggered by one or either of these events, and can be used to turn on an external power supply. The PWR pin is under software control, so that when a task is complete, the system power can then be shut down. The DS1500/DS1510 power-on reset can be used to detect a system power down or failure and hold the CPU in a safe reset state until normal power returns and stabilizes the RST output is used for this function.

The DS1500 is a clock/calendar chip with the features described above. An external crystal and battery are the only components required to maintain time-of-day and memory status in the absence of power. The DS1510 incorporates the DS1500 chip, a kHz crystal, and a lithium battery in a complete, self-contained timekeeping module. The entire unit is designed by Dallas Semiconductor to provide a minimum of 10 years of timekeeping and data retention in the absence of VCCI is guaranteed.
2 of 25

DS1500/DS1510 BLOCK DIAGRAM Figure 1

DS1500/DS1510

VCCI

DS1500/DS1510 RTC OPERATING MODES Table 1

VCCI > VPF

CS OE WE DQ0-DQ7 A0-A4

VIH X

High-Z

MODE Deselect

VIL X VIL

Write

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Datasheet ID: DS1510Y 508383