AMIS-30624 AMI Semiconductor, Inc., AMIS-30624 Datasheet - Page 40

• Manufacturer Part Number: AMIS-30624
• Description: I2c Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30624 I
2) If the microcontroller wants to receive information from motordriver_2:
Even in this case the master generates the timing and terminates the transfer.
Generation of the signals on the I
transferring data on the bus. Bus clock signals from a master can only be altered when they are stretched by a slow slave device
holding-down the clock line.
16.3 General Characteristics
Both SDA and SCK are bi-directional lines connected to a positive supply voltage via a pull-up resistor (see Figure 24). When the bus is
free both lines are HIGH. The output stages of the devices connected to the bus must have an open drain to perform the wired-AND
function. Data on the I
dependent on the maximum bus capacitance limit (See C
16.4 Bit Transfer
The levels for logic ‘0’ (LOW) and ‘1’ (HIGH) are not fixed in the I
the levels are specified in Table 5. One clock pulse is generated for each data bit transferred.
16.4.1. Data Validity
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the data line can only change
when the clock signal on the SCL line is LOW (See Figure 25).
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
www.amis.com
• Microcontroller (master) addresses motordriver_2 (slave)
• Microcontroller (master-receiver) receives data from motordriver_2 (slave-transmitter)
• Microcontroller terminates the transfer
Serial Clock Line
Serial Data Line
Clock IN
Clock OUT
AMIS-30624
2
C-bus can be transferred up to 400kbits/s in fast mode. The number of interfaces connected to the bus is
2
C Microstepping Motordriver
SCK
2
C-bus is always the responsibility of the master device. It generates its own clock signal when
2
Data IN
SCK
SDA
Data OUT
Figure 24: Connection of a Device to the I
SDA
Figure 25: Bit Transfer on the I
Data line stable
-> Data valid
B
1
in Table 6) and the available number of addresses.
2
40
C standard but dependent on the used VDD level. Using AMIS-30624,
Clock IN
data allowed
Clock OUT
Change of
MASTER
2
C-bus
SCL
2
C-bus
PC20070217.2
Data IN
Data OUT
SDA
+5 V
R
PC20060925.7
p
Data Sheet
R
p