MC33780 Datasheet, PDF (3/37 Pages) Freescale Semiconductor, Inc – Dual DBUS Master with Differential Drive and Frequency Spreading

TERMINAL CONNECTIONS
TERMINAL CONNECTIONS
RST
1
CS
2
INT
3
MOSI
4
SCLK
5
MISO
6
CLK
7
GND
8
16
GND
15
D0L
14
D0H
13
VSUP
12
D1H
11
D1L
10
GND
9
VCC
Figure 3. 33780 Terminal Connections
Table 1. 33780 Terminal Definitions
A functional description of each terminal can be found in the Functional Terminal Descriptions section beginning on page 13.
Terminal
Terminal
Name
Terminal
Function
Formal Name
Definition
1
RST
Reset
IC Reset
A low level on this terminal returns all registers to a known state as
indicated in the section entitled Register and Bit Descriptions.
2
CS
Input
SPI Chip Select Input When this signal is high, SPI signals are ignored. Asserting this terminal
low starts an SPI transaction. The SPI transaction is signaled as
completed when this signal returns high.
3
INT
Output
Interrupt Output This output will be asserted low when an enabled interrupt condition
occurs. It contains a pullup current source that will perform a pullup when
unasserted.
4
MOSI
Input
Master Out Slave In SPI data into this IC. This data input is sampled on the positive edge of
SCLK.
5
SCLK
Input
Serial Data Clock Clocks in/out the data to/from the SPI. MISO data changes on the
negative transition of the SCLK. MOSI is sampled on the positive edge of
the SCLK.
6
MISO
Output
Master In Slave Out SPI data sent to the MCU by this device. This data output changes on the
negative edge of SCLK. When CS is high, this terminal is high
impedance.
7
CLK
Input
Clock Input
4.0 MHz clock input.
8
GND
Ground
Ground
Ground reference for analog and digital circuits.
9
VCC
Input
Logic Supply
Logic power source input.
10
GND
Ground
Power Ground Bus 1 power return.
11
D1L
Output Driver Low-Side Bus 1 Bus 1 low side.
12
D1H
Output Driver High-Side Bus 1 Bus 1 high side.
13
VSUP
Output
Positive Supply for This supply input is used to provide the positive level output of the bus.
Bus Output
14
D0H
Output Driver High-Side Bus 0 Bus 0 high side.
15
D0L
Output Driver Low-Side Bus 0 Bus 0 low side.
16
GND
Ground
Power Ground Bus 0 power return.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33780
3