604-00050 Parallax Inc, 604-00050 Datasheet - Page 4

• Manufacturer Part Number: 604-00050
• Description: IC FLOATING-PT COPROC V3 18-DIP
• Manufacturer: Parallax Inc

Specifications of 604-00050

• Processor Type: Floating-Point Co-Processor
• Voltage: 2.7V ~ 5.5V
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Speed: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Connecting to the uM-FPU V3.1 chip
The uM-FPU V3.1 chip can be interfaced using one of several different types of SPI interface, or an I
The different types are as follows:
By default, the CS pin is used to select between SPI or I
by the SPI bus interface, a parameter byte stored in Flash must be set. This is described below, in the section called
SPI Bus Interface.
2-wire SPI interface
When the uM-FPU V3.1 chip is connected directly to the microcontroller as a single device, no chip select is
required, and either a 2-wire or 3-wire SPI interface can be used depending on the capabilities of the
microcontroller. The 2-wire SPI connection uses a single bidirectional pin for both data input and data output. When
a 2-wire SPI interface is used, the SOUT and SIN pins should not be connected directly together, they must be
connected through a 1K resistor. The microcontroller data pin is connected to the SIN pin. The CS pin is tied low
to select SPI mode at Reset, and must remain low during operation. The connection diagrams are shown below.
Micromega Corporation
• 2-wire SPI interface, single device
• 3-wire SPI interface, single device
• SPI bus interface, multiple devices
• I
2
C interface, multiple devices
Microcontroller Pins
DATA
CLK
2-wire SPI Connection
VDD
1
2
3
4
5
6
7
8
9
4
/MCLR
AN0
AN1
CS
EXTIN
OSC1
OSC2
SEROUT
SERIN
2
C interfaces. To use the CS pin as a chip select, as required
uM-FPU V3
SOUT/SCL
SIN/SDA
AVDD
AVSS
SCLK
OUT0
OUT1
VDD
VSS
18
17
16
15
14
13
12
10
11
Connecting to the uM-FPU V3.1
VDD
1K
uM-FPU V3.1 Datasheet
2
C interface.