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| 型號： | ISL12022MAIBZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 18/31頁 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR TEMP SNSR 20SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 38 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，夏令時，閏年，SRAM |
| 存儲容量： | 128B |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC |
| 包裝： | 管件 |
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ISL12022MA
25
FN7575.5
September 5, 2012
ALPHA Hot Register (ALPHAH)
The ALPHA Hot variable is 7 bits and is defined as the temperature
coefficient of Crystal from the XT0 value to +85°C (both Alpha Hot
and Alpha Cold must be programmed to provide full temperature
compensation). It is normally given in units of ppm/°C2, with a
typical value of -0.034. Like the ALPHA Cold version, a scaled
version of the absolute value of this coefficient is used in order to
get an integer value. Therefore, ALP_H <7:0> is defined as the
(|Actual Alpha Hot Value| x 2048) and converted to binary. For
example, a crystal with Alpha Hot of -0.034ppm/°C2 is first scaled
(|2048*(-0.034)| = 70d) and then converted to a binary number
of 01000110b.
The practical range of Actual ALPHAH values is from -0.020 to -
0.060.
The ISL12022MA has a preset ALPHAH value corresponding to
the crystal in the module. This value is recalled on initial
power-up and is preset in device production. It is READ ONLY and
cannot be overwritten by the user.
User Registers (Accessed by
Using Slave Address 1010111x)
Addresses [00h to 7Fh]
These registers are 128 bytes of battery-backed user SRAM. The
separate I2C slave address must be used to read and write to
these registers.
I2C Serial Interface
The ISL12022MA supports a bi-directional bus oriented protocol.
The protocol defines any device that sends data onto the bus as a
transmitter and the receiving device as the receiver. The device
controlling the transfer is the master and the device being
controlled is the slave. The master always initiates data transfers
and provides the clock for both transmit and receive operations.
Therefore, the ISL12022MA operates as a slave device in all
applications.
All communication over the I2C interface is conducted by sending
the MSB of each byte of data first.
Protocol Conventions
Data states on the SDA line can change only during SCL LOW
periods. SDA state changes during SCL HIGH are reserved for
indicating START and STOP conditions (see Figure 16). On power-
up of the ISL12022MA, the SDA pin is in the input mode.
All I2C interface operations must begin with a START condition,
which is a HIGH to LOW transition of SDA while SCL is HIGH. The
ISL12022MA continuously monitors the SDA and SCL lines for the
START condition and does not respond to any command until this
condition is met (see Figure 16). A START condition is ignored
during the power-up sequence.
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while SCL is
HIGH (see Figure 16). A STOP condition at the end of a read
operation or at the end of a write operation to memory only
places the device in its standby mode.
11001
20.5
11010
20.0
11011
19.5
11100
19.0
11101
18.5
11110
18.0
11111
17.5
TABLE 27. ALPHAH REGISTER
ADDR 7
6543210
2Dh
D ALP_H
6
ALP_H
5
ALP_H
4
ALP_H
3
ALP_H
2
ALP_H
1
ALP_H
0
TABLE 26. XT0 VALUES (Continued)
XT<4:0>
TURNOVER TEMPERATURE
FIGURE 16. VALID DATA CHANGES, START AND STOP CONDITIONS
SDA
SCL
START
DATA
STOP
STABLE
CHANGE
DATA
STABLE
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