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R&S RTC1000 User Manual

R&S RTC1000
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Serial Bus Analysis
R&S
®
RTC1000
125User Manual 1335.7352.02 ─ 02
Figure 11-3: I2C 7-bit address
The format of a simple I
2
C message (frame) with an address length of 7 bit has the
following structure:
Start condition: falling slope on SDA (serial data), while SCL (serial clock) is high
7-bit address (write or read slave)
Read/Write bit (R/W): indicates if the data is to be written or read out from the slave
Acknowledge bit (ACK): is issued by the recipient of the previous byte if transmis-
sion was successful. Exception: for read access, the master terminates the data
transmission with a NACK bit after the last byte.
Data: a series of data bytes with an ACK bit after each byte
Stop condition: rising slope on SDA (serial data), while SCL (serial clock) is high
11.3.1
I
2
C Bus Configuration
Before you configure the bus, set the correct logic level (threshold).
For analog channels, see "THRESHOLD menu" on page 36.
For digital channels, see "To set the threshold for logic states" on page 108. The
default value is 500 mV.
To select the I
2
C bus
1. Press the BUS key in the Vertical section.
2. In the short menu, select the bus: "B1" or "B2".
3. In the "BUS" menu, press the softkey "BUS TYPE"
4. Use the UNIVERSAL knob to select "I2C".
To decode the I
2
C bus, the instrument needs information which logic channel is con-
nected to the clock (SCL) and which is connected to the data line (SDA).
I
2
C Bus (Option R&S RTC-K1)

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R&S RTC1000 Specifications

General IconGeneral
BrandR&S
ModelRTC1000
CategoryTest Equipment
LanguageEnglish

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