VS6502V015/T2 STMicroelectronics, VS6502V015/T2 Datasheet - Page 19

• Manufacturer Part Number: VS6502V015/T2
• Description: SENSOR COLOR VGA CMOS SMOP
• Manufacturer: STMicroelectronics
• Type: CMOS Imagingr

Specifications of VS6502V015/T2

• Pixel Size: 5.6µm x 5.6µm
• Active Pixel Array: 644H x 484V
• Frames Per Second: 30
• Voltage - Supply: 2.6 V ~ 3.6 V
• Package / Case: SMOP2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3884-1

VS6502
3
3.1
3.2
3.2.1
Serial Control Bus
General description
The 2-wire I2C serial interface bus is used to read and write the sensor control registers.
Some status registers are read-only.
The main features of the serial interface include:
Serial communication protocol
The co-processor must perform the role of communication ‘master’ and the sensor acts as a ‘slave’.
The communication from host to sensor takes the form of 8-bit data with a maximum serial clock
frequency of 100 kHz. Since the serial clock is generated by the bus master it determines the data
transfer rate. Data transfer protocol on the bus is illustrated in
Data format
Information is packed in 8-bit packets (bytes) always followed by an acknowledge bit. The internal
data is produced by sampling sda at a rising edge of scl. The external data must be stable during
the high period of scl. Exceptions to this are start (S) or stop (P) conditions when sda falls or rises
respectively, while scl is high.
A message contains at least two bytes preceded by a start condition and followed by either a stop
or repeated start, (Sr) followed by another message.
The first byte contains the device address byte which includes the data direction read, (r), ~write,
(~w), bit.
SDA
SCL
Variable length read/write messages
Indexed addressing of information source or destination within the sensor
Automatic update of the index after a read or write message
Message abort with negative acknowledge from the master
Byte oriented messages
Start condition
S
Figure 16: Serial Interface data transfer protocol
MSB
1
2
Address or data byte
3
4
5
6
7
LSB
8
Figure
Acknowledge
A
16.
Stop condition
P
Serial Control Bus
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