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參數(shù)資料
| 型號： | DS1500YN |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 0K |
| 描述： | IC RTC Y2KC W/NV CTRL 5V 32-DIP |
| 標(biāo)準(zhǔn)包裝： | 13 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，閏年，NVSRAM，方波輸出，監(jiān)視計時器，Y2K |
| 存儲容量： | 256B |
| 時間格式： | HH:MM:SS（24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2.5 V ~ 3.7 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 32-DIP 模塊（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 32-EDIP |
| 包裝： | 管件 |
DS1500 Y2KC Watchdog RTC with Nonvolatile Control
13 of 20
SETTING THE CLOCK
It is recommended to halt updates to the external set of double buffered RTC registers when writing to the clock.
The (TE) bit should be used as described above before loading the RTC registers with the desired RTC count (day,
date, and time) in 24-hour BCD format. Setting the (TE) bit to 1 transfers the new values written to the internal RTC
registers and allows normal operation to resume.
CLOCK ACCURACY
A standard 32.768kHz quartz crystal should be directly connected to the DS1500 X1 and X2 oscillator pins. The
crystal selected for use should have a specified load capacitance (CL) of either 6pF or 12.5pF, and the crystal
select (CS) bit set accordingly. For more information about crystal selection and crystal layout considerations, refer
to Application Note 58: Crystal Considerations with Maxim Real-Time Clocks (RTCs). An external 32.768kHz
oscillator can also drive the DS1500. To achieve low-power operation when using an external oscillator, it may be
necessary to connect the X1 pin to the external oscillator signal through a series connection consisting of a resistor
and a capacitor. A typical configuration consists of a 1.0M resistor in series with a 100pF ceramic capacitor. When
using an external oscillator the X2 pin must be left open.
Table 2. Register Map
ADDRESS
DATA
FUNCTION
BCD
RANGE
B7
B6
B5
B4
B3
B2
B1
B0
00h
0
10 Seconds
Seconds
00–59
01h
0
10 Minutes
Minutes
00–59
02h
0
10 Hours
Hour
Hours
00–23
03h
0
Day
1–7
04h
0
10 Date
Date
01–31
05h
EOSC
E32K
BB32
10 MO
Month
01–12
06h
10 YEAR
Year
00–99
07h
10 CENTURY
Century
00–39
08h
AM1
10 Seconds
Seconds
Alarm Seconds
00–59
09h
AM2
10 Minutes
Minutes
Alarm Minutes
00–59
0Ah
AM3
0
10 Hours
Hour
Alarm Hours
00–23
0Bh
AM4
Dy/Dt
10 Date
Day/Date
Alarm Day/Date
1–7/1–31
0Ch
0.1 Second
0.01 Second
Watchdog
00–99
0Dh
10 Second
Second
Watchdog
00–99
0Eh
BLF1
BLF2
PRS
PAB
TDF
KSF
WDF
IRQF
Control A
0Fh
TE
CS
BME
TPE
TIE
KIE
WDE
WDS
Control B
10h
Extended RAM Address
RAM Address LSB
00–FF
11h
Reserved
12h
Reserved
13h
Extended RAM Data
RAM Data
00–FF
14h-1Fh
Reserved
0 = “0” and are read only.
POWER-UP DEFAULT STATES
These bits are set upon power-up: EOSC = 0, E32K = 0, TIE = 0, KIE = 0, WDE = 0, and WDS = 0.
Note: Unless otherwise specified, the state of the control/RTC/SRAM bits in the DS1500 is not defined upon initial
power application; the DS1500 should be properly configured/defined during initial configuration.
USING THE CLOCK ALARM
The alarm settings and control reside within registers 08h to 0Bh (Table 2). The TIE bit and alarm mask bits AM1 to
AM4 must be set as described below for the IRQ or PWR outputs to be activated for a matched alarm condition.
The alarm functions as long as at least one supply is at a valid level. Note that activating the PWR pin requires the
use of VBAUX.
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