22 FN6682.3 December 6, 2011 ALPHA Hot Register (ALPHAH) The ALPHA Hot variable is 7 bits and is defined as the temperature coefficien" />
參數(shù)資料
型號(hào)： ISL12023IVZ-T
廠商： Intersil
文件頁(yè)數(shù)： 15/29頁(yè)
文件大?。?/td> 0K
描述： IC RTC/CLDR TEMP SNSR 14-TSSOP
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 2,500
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，夏令時(shí)，閏年，SRAM
存儲(chǔ)容量： 128B
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
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： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 帶卷 (TR)
ISL12023
22
FN6682.3
December 6, 2011
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 ISL12023 has a preset ALPHAH value corresponding to the
crystal in the module. This value is recalled on initial power-up
and should never be changed for best temperature
compensation performance, although the user may override this
preset value if so desired.
The ALPHAH register should only be changed while the TSE
(Temp Sense Enable) bit is “0”.
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 ISL12023 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 ISL12023 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 14). On power-up
of the ISL12023, 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
ISL12023 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 14). 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 14). 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.
An acknowledge (ACK) is a software convention used to indicate
a successful data transfer. The transmitting device, either master
or slave, releases the SDA bus after transmitting 8 bits. During
the ninth clock cycle, the receiver pulls the SDA line LOW to
acknowledge the reception of the 8 bits of data (see Figure 15).
The ISL12023 responds with an ACK after recognition of a START
condition followed by a valid Identification Byte, and once again
after successful receipt of an Address Byte. The ISL12023 also
responds with an ACK after receiving a Data Byte of a write
01000
29.0
00111
28.5
00110
28.0
00101
27.5
00100
27.0
00011
26.5
00010
26.0
00001
25.5
00000
25.0
10000
25.0
10001
24.5
10010
24.0
10011
23.5
10100
23.0
10101
22.5
10110
22.0
10111
21.5
11000
21.0
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
ADD
R
7
65
4321
0
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
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