参数资料
| 型号： | ISL12024IRTCZ-T |
| 厂商： | Intersil |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDER 64BIT 8-TDFN |
| 标准包装： | 6,000 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，唯一 ID |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TDFN |
| 供应商设备封装： | 8-TDFN（3x3） |
| 包装： | 带卷 (TR) |
12
FN6749.1
December 15, 2011
The effective series load capacitance is the combination of
CX1 and CX2:
For example:
CLOAD(ATR = 00000) = 12.5pF,
CLOAD(ATR = 100000) = 4.5pF, and
CLOAD(ATR = 011111) = 20.25pF.
The entire range for the series combination of load
capacitance goes from 4.5pF to 20.25pF in 0.25pF steps.
Note that these are typical values.
DTR Register - DTR2, DTR1, DTR0: Digital
Trimming Register
The digital trimming Bits DTR2, DTR1 and DTR0 adjust the
number of counts per second and average the ppm error to
achieve better accuracy.
DTR2 is a sign bit, where:
DTR2 = 0 means frequency compensation is >0.
DTR2 = 1 means frequency compensation is <0.
DTR1 and DTR0 are scale bits. DTR1 gives 10 ppm
adjustment and DTR0 gives 20 ppm adjustment.
A range from -30ppm to +30ppm can be represented by
using the three DTR bits above.
PWR Register: SBIB, BSW
SBIB: Serial Bus Interface (Enable)
The serial bus can be disabled in Battery Backup Mode by
setting this bit to “1”. This will minimize power drain on the
battery. The Serial Interface can be enabled in Battery
Backup Mode by setting this bit to “0” (default is “0”). See
BSW: Power Control Bit
The Power Control bit, BSW, determines the conditions for
switching between VDD and Backup Battery. There are two
options:
Option 1. Standard/Default Mode: Set “BSW = 0”
Option 2. Legacy Mode: Set “BSW = 1”
See “Power Control Operation” on page 13 for more details.
page 23 for important details.
Unique ID Registers
There are eight register bytes for storing the device ID.
(Address 0020h to 0027h). Each device contains these
bytes to provide a unique 64-bit ID programmed and tested
in the factory before shipment. These registers are
read-only, intended for serialization of end equipment, and
cannot be changed or overwritten.
Device Operation
Writing to the Clock/Control Registers
Changing any of the bits of the clock/control registers
requires the following steps:
1. Write a 02h to the Status Register to set the Write Enable
Latch (WEL). This is a volatile operation, so there is no
delay after the write. (Operation preceded by a start and
ended with a stop).
2. Write a 06h to the Status Register to set both the Register
Write Enable Latch (RWEL) and the WEL bit. This is also
a volatile cycle. The zeros in the data byte are required.
(Operation proceeded by a start and ended with a stop).
Write all eight bytes to the RTC registers, or one byte to the
SR, or one to five bytes to the control registers. This
sequence starts with a start bit, requires a slave byte of
“11011110” and an address within the CCR and is terminated
by a stop bit. A write to the EEPROM registers in the CCR
will initiate a non-volatile write cycle and will take up to 20ms
to complete. A write to the RTC registers (SRAM) will require
much shorter cycle time (t = tBUF). Writes to undefined areas
have no effect. The RWEL bit is reset by the completion of a
write to the CCR, so the sequence must be repeated to
again initiate another change to the CCR contents. If the
sequence is not completed for any reason (by sending an
incorrect number of bits or sending a start instead of a stop,
for example) the RWEL bit is not reset and the device
remains in an active mode. Writing all zeros to the status
TABLE 5. DIGITAL TRIMMING REGISTERS
DTR REGISTER
ESTIMATED FREQUENCY
PPM
DTR2
DTR1
DTR0
00
0
01
0
+10
00
1
+20
01
1
+30
10
0
11
0
-10
10
1
-20
11
1
-30
FIGURE 8. DIAGRAM OF ATR
CX1
X1
X2
CRYSTAL
OSCILLATOR
CX2
C
LOAD
1
C
X1
-----------
1
C
X2
-----------
+
-----------------------------------
=
C
LOAD
16 b5
8 b4
4 b3
2 b2
1 b1
0.5 b0
9
+
+
+
+
+
+
2
-----------------------------------------------------------------------------------------------------------------------------
pF
=
(EQ. 2)
ISL12024IRTC
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| ISL12024IVZ-T | 功能描述:实时时钟 REAL TIME CLK/CLNDR W/EEPROM IN 8LD RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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