AT32UC3C1512C Automotive Atmel Corporation, AT32UC3C1512C Automotive Datasheet - Page 732

• Manufacturer Part Number: AT32UC3C1512C Automotive
• Manufacturer: Atmel Corporation

28.5
28.6
Table 28-4.
28.7
28.7.1
9166C–AVR-08/11
Pin Name
TWD
TWCK
TWALM
Application Block Diagram
I/O Lines Description
Product Dependencies
I/O Lines
I/O Lines Description
Figure 28-2. Application Block Diagram
In order to use this module, other parts of the system must be configured correctly, as described
below.
TWDand TWCK are bidirectional lines, connected to a positive supply voltage via a current
source or pull-up resistor (see
high. The output stages of devices connected to the bus must have an open-drain or open-col-
lector to perform the wired-AND function.
TWALM is used to implement the optional SMBus SMBALERT signal.
TWALM, TWD, and TWCK pins may be multiplexed with I/O Controller lines. To enable the
TWIS, the user must perform the following steps:
• Program the I/O Controller to:
Rp: Pull up value as given by the I²C Standard
Host with
Interface
– Dedicate TWD, TWCK, and optionally TWALM as peripheral lines.
– Define TWD, TWCK, and optionally TWALM as open-drain.
TWI
Pin Description
Two-wire Serial Data
Two-wire Serial Clock
SMBus SMBALERT
TWD
TWCK
serial EEPROM
Atmel TWI
Slave 1
Figure 28-5 on page
I²C RTC
Slave 2
controller
I²C LCD
Slave 3
734). When the bus is free, both lines are
I²C temp.
Slave 4
sensor
Rp
AT32UC3C
Input/Output
Input/Output
Input/Output
Type
Rp
VDD
732