CY3242-IOX Cypress Semiconductor Corp, CY3242-IOX Datasheet - Page 4

• Manufacturer Part Number: CY3242-IOX
• Description: Development Kit
• Manufacturer: Cypress Semiconductor Corp
• Series: PSoC®r

Specifications of CY3242-IOX

• Silicon Manufacturer: Cypress
• Application Sub Type: Expander
• Kit Application Type: Interface
• Silicon Core Number: CY8C9520, CY8C9540 And CY8C9560
• Features: I2C Port Expander Evaluation Kit
• Main Purpose: Interface, GPIO Expander
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: CY8C9520, CY8C9540, CY8C9560
• Primary Attributes: 8-Bit 60-Port GPIO Expander
• Secondary Attributes: 3 Momentary Switches, Speaker, 56 LEDs, 7-Seg LED
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 428-1911

The A0 line is always used to define the corresponding bit
of the I
A0 is a strong pull up or a strong pull down (connected
through a resistor, 330 ohms or less, to Vdd or Vss), then
that is the only address line being specified and the A1-A6
lines are used as GPIO. If A0 is a weak pull up or a weak
pull down (connected to Vdd or Vss through 75 - 200-
kohm resistor), then A0 is not the only externally defined
address bit.
There is a pin assigned to be A1 if it is needed. This pin
can be pulled up or pulled down strong or weak with a
resistor. As with A0, the type of pull determines whether
the address bit is the last externally defined address bit.
Different from A0, A1 is not dedicated as an address pin. It
is only used if A0 is not the only address bit externally
defined. There are also predefined pins for A2, A3, A4, A5
and A6 that will only be used for addressing if needed.
The last address bit in the chain is pulled strong. That
way, only the number of pins needed to assign the
address desired for the part are allocated as address pins;
any pins not used for address bits are available to be used
as GPIO pins. The table, “Device Addressing,” on page 3
of the I
device I
For example, to set the I
simply set A0 to LS, Strong Pull Down. The other address
pins have their jumpers removed, making them available
for use as GPIO. The resulting I
Note before using, make sure all address pins that use the
address selection jumper are not connected to any
peripherals (LEDs, inputs/outputs, etc.).
September 13, 2006
A
6
7
0
O
p
e
n
A
5
6
1
O
p
e
n
2
2
C address. This pin should be pulled up or down. If
2
C Port Expander Data Sheet defines the resulting
C address.
A
4
5
0
O
p
e
n
A
3
4
0
O
p
e
n
A
2
3
0
O
p
e
n
A
1
2
O
p
e
n
0
2
C address to 0x40 (0100000), we
A0
1
0
LS
N/A
0
0
N/A
2
C address is as follows.
Jumper Address Pins
I2C Address Bits
Bit Value
Jumper Setting
Rev. **
CY3242-IOX
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