参数资料
| 型号： | ISL97649BIRZ |
| 厂商： | Intersil |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC POWER MANAGEMENT |
| 标准包装： | 75 |
| 系列： | * |
ISL97649B
A valid identification byte (Byte 1) contains 100111 as the six
MSBs. The 7th bit could be either 0 or 1 in the read operation,
while it is the data LSB (D0) in the write operation. The LSB is in
the read/write bit. Its value is 1 for a read operation and 0 for a
write operation (Figures 19 and 20).
Read Operation
A read operation consists of one instruction byte followed by one
data byte (Figure 19). The master initiates a START and the
identification byte with the R/W bit set to 1; the ISL97649B
responds with an ACK; and then the ISL97649B transmits the
data byte. The master terminates the read operation (issues a
STOP condition) following the last bit of the data byte (Figure 19).
Write Operation
A write operation requires a START condition followed by a valid
identification byte, a data byte, and a STOP condition (Figure 20).
After each of the two bytes, the ISL97649B responds with an
ACK. If the data byte is also to be written to non-volatile memory,
the ISL97649B begins its internal write cycle to non-volatile
memory. During the internal non-volatile write cycle, the device
ignores transitions at the SDA and SCL pins (Figure 21), and the
SDA output is at high impedance state. When the internal
non-volatile write cycle is completed, the ISL97649B enters its
standby state. The LSB in Byte 2 determines whether the data
byte is to be written to volatile and/or non-volatile memory.
15
Data Protection
A STOP condition also acts as a protection of non-volatile
memory. A valid identification byte, a data byte, and total
number of SCL pulses act as a protection of both volatile and
non-volatile registers. During a write sequence, the data byte is
loaded into an internal shift register as it is received. If Byte 2
LSB is 1, the data byte is transferred to the register only. If Byte 2
LSB is 0, then the STOP condition initiates the internal write cycle
to non-volatile memory.
ISL97649B Programming
Figure 19 shows the serial data format for reading the register.
Figure 20 shows the serial data format for writing the register
and Figure 21 for programming EEPROM.
The ISL97649B uses a 6-bit I2C address, which is 100111xx. The
complete read and write protocol is shown in Figures 19 and 20.
FN7927.2
June 27, 2013
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