NTP3000 查看數據表（PDF） - Unspecified
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NTP3000 Datasheet PDF : 37 Pages
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Power Integrated Processor for Digital Amplifier
NTP3000
4.1. Start Condition and Stop Condition
I2C bus of NTP3000 is composed of serial clock line (SCL) and serial data line (SDA). SDA can be
changed only when SCL is in low state with exceptions of start condition or stop condition. START
condition means that master is to start transferring data to slave. To make START condition, transit SDA
state from high to low when SCL is high. STOP condition means that master is to finish transferring data
to slave. To make STOP condition, transit SDA state from low to high when SCL is high.
acklowedgement
Slave address
signal from NTP-3000
R
A
A
SDA
010 1 01 0
MSB LSB
MSB
SCL
LSB
W
1 2 3 4 5 6 7 8 9 1 2-8
S
or
Sr
byte complete
START or
A
9
Sr
or
P
STOP or
repeated START
repeated START
condition
condition
Figure 4 START Condition and STOP Condition
4.2. I2C Address
The I2C Address of NTP3000 is composed of 7-bit except for Acknowledge bit with 7th bit depending on
AD pin input (Table 1). If AD is low or pulled down, the Address is 0x54 and if AD is high or pulled up it is
0x56.
AD
I2C Address
0
0x54
1
0x56
Table 1 I2C Address
4.3. Write or Read
A bit after 7-bit slave Address means to WRITE (0) or to READ (1).
4.3.1. Writing to NTP3000
I2C data can be written on NTP3000 by using modified I2C write operation. Figure 5 (a) shows writing 1-
byte register data procedure. Followed by START condition, master notices the data transfer mode to
NTP3000 by sending slave Address with WRITE operation bit (W). NTP3000 sends acknowledgement
bit (ACK) to master when it receives the slave Address correctly and is ready for response. After
checking the ACK, master sends NTP3000 the sub-Address which means the register Address of
NTP3000. The sub-Address is composed of 7-bit register Address and 1-bit Auto Increment Flag (AIF).
When NTP3000 receives the sub-Address correctly, NTP3000 sends ACK to master. After checking the
ACK, master sends data which means the register value to NTP3000. Master checks ACK and 1-byte
register data writing procedure is finished by initiating the STOP condition.
Notice)
If the sub-Address is floating point coefficient register (0x40 ~ 0x5F), 4-byte register data should be
written.
AIF is used for writing multi-byte to NTP3000. Multi-byte register data writing procedure is shown in
Figure 5 (b), (c).
Copyright © NeoFidelity, Inc. 2005
Preliminary datasheet – NeoFidelity reserves the right to change specifications at any time without prior notice
6
R0.73-11.2006
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