UPC1857A View Datasheet(PDF) - NEC => Renesas Technology
Part Name
Description
Manufacturer
UPC1857A Datasheet PDF : 44 Pages
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µPC1857A
3.2 Data Transfer Format
Figure 3-4 shows an example of data transfer in write mode.
SDA
Figure 3-4. Example of Data Transfer in Write Mode
Slave address
SA0
Subaddress
Data
D6 D5 D4 D3 D2 D1 D0 W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 D3 D2 D1 D0
ACK
SCL
Remark W: Write mode, ACK: Acknowledge bit
Data is composed of 8 bits. One acknowledge bit always follows these 8 bits of data. Data must be transferred
starting from the MSB.
The 1 byte immediately following the start condition specifies a slave address (chip address). This slave address
is composed of 7 bits.
Table 3-1 shows the slave address of the µPC1857A. This slave address is registered by Philips.
Table 3-1. Slave Address of µPC1857A
Slave Address
Bias Voltage of ADS (Pin 22)
D6
D5
D4
D3
D2
D1Note
D0
5V
1
0
0
0
1
1
0
GND
1
0
0
0
1
0
0
Note The user can set bit D1 freely.
0: Bias voltage of ADS (pin 22) is 0 V.
1: Bias voltage of ADS (pin 22) is 5 V.
The 1 bit following the slave address is a read/write bit which specifies the direction of the data to be subsequently
transferred. Write “0” to this read/write bit because the µPC1857A is write mode only.
The byte following the slave address is the subaddress byte of the µPC1857A.
The µPC1857A has five subaddresses, from SA0 to SA4, and each of these addresses is composed of 8 bits. The
data to be set to a subaddress follows this subaddress byte.
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