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參數(shù)資料
| 型號(hào)： | DS1216H |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA32 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 123K |
| 代理商： | DS1216H |
DS1216
4 of 13
NONVOLATILE CONTROLLER OPERATION
The DS1216 SmartWatch performs circuit functions required to make a CMOS RAM nonvolatile. First, a
switch is provided to direct power from the battery or VCC supply, depending on which voltage is greater.
This switch has a voltage drop of less than 0.2 volts. The second function which the SmartWatch provides
is power–fail detection. Power–fail detection occurs at VTP. The DS1216 constantly monitors the VCC
supply. When VCC goes out of tolerance, a comparator outputs a power–fail signal to the chip enable
logic. The third function accomplishes write protection by holding the chip enable signal to the memory
within 0.2 volts of VCC or battery. During nominal power supply conditions the memory chip enable
signal will track the chip enable signal sent to the socket with a maximum propagation delay of 7 ns for
the 5 volt and 12 ns for the 3.3 volt version.
FRESHNESS SEAL
Each DS1216 is shipped from Dallas Semiconductor with its lithium energy source disconnected,
insuring full energy capacity. When VCC is first applied at a level greater than the lithium energy source is
enabled for battery backup operation.
SMARTWATCH REGISTER INFORMATION
The SmartWatch information is contained in eight registers of 8 bits, each of which is sequentially
accessed one bit at a time after the 64–bit pattern recognition sequence has been completed. When
updating the SmartWatch registers, each must be handled in groups of 8 bits. Writing and reading
individual bits within a register could produce erroneous results. These read/ write registers are defined
in Figure 2.
Data contained in the SmartWatch registers is in binary coded decimal format (BCD). Reading and
writing the registers is always accomplished by stepping through all eight registers, starting with bit 0 of
register 0 and ending with bit 7 of register 7.
AM–PM/12/24 MODE
Bit 7 of the hours register is defined as the 12– or 24–hour mode select bit. When high, the 12–hour
mode is selected. In the 12–hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24–hour
mode, bit 5 is the second 10–hour bit (20–23 hours).
OSCILLATOR AND RESET BITS
Bits 4 and 5 of the day register are used to control the RESET and oscillator functions. Bit 4 controls the
RESET
(pin 1). When the RESET bit is set to logic 1, the RESET input pin is ignored. When the RESET bit
is set to logic 0, a low input on the RESET pin will cause the SmartWatch to abort data transfer without
changing data in the watch registers. Bit 5 controls the oscillator.
When set to logic 1, the oscillator is
off. When set to logic 0, the oscillator turns on and the watch becomes operational.
These bits are
shipped from the factory set to logic 1.
ZERO BITS
Registers 1,2,3,4,5, and 6 contain one or more bits which will always read logic 0. When writing these
locations, either a logic 1 or 0 is acceptable.
ADDITIONAL INFORMATION
Please see Application Notes 4 and 52 for information regarding optional modifications and utilization of
the Phantom Clock contained within the SmartWatch.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1216C | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1216E | 0 TIMER(S), REAL TIME CLOCK, DIP28 |
| DS1225Y-200 | 8K X 8 NON-VOLATILE SRAM MODULE, 200 ns, PDIP28 |
| DS1230AB-120 | 32K X 8 NON-VOLATILE SRAM MODULE, 120 ns, DMA28 |
| DS1230AB-150 | 32K X 8 NON-VOLATILE SRAM MODULE, 150 ns, DMA28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1216MP000 | 制造商:Thomas & Betts 功能描述:100A,PLG,2P3W,MG,216,208V |
| DS1216MR000 | 制造商:Thomas & Betts 功能描述:100A,NLT,2P3W,MG,216,208V |
| DS1216MRA00 | 制造商:Thomas & Betts 功能描述:100A,NLT,2P3W,MG,AGL,208V |
| DS1217 | 制造商:BB 制造商全稱:BB 功能描述:8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
| DS1217A | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Read/Write Cartridge |
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