PRELIMINARY
PSoC® 5: CY8C55 Family Datasheet
SWV. SWV output.
3. Pin Descriptions
USBIO, D+. Provides D+ connection directly to a USB 2.0 bus.
May be used as a digital I/O pin; it is powered from VDDD instead
of from a VDDIO. Pins are No Connect (NC) on devices without
USB.[8]
IDAC0, IDAC1, IDAC2, IDAC3. Low-resistance output pin for
high-current DACs (IDAC).
OpAmp0out, OpAmp1out, OpAmp2out, OpAmp3out. High
current output of uncommitted opamp.[7]
USBIO, D-. Provides D- connection directly to a USB 2.0 bus.
May be used as a digital I/O pin; it is powered from VDDD instead
of from a VDDIO. Pins are No Connect (NC) on devices without
USB.[8]
Extref0, Extref1. External reference input to the analog system.
OpAmp0-, OpAmp1-, OpAmp2-, OpAmp3-. Inverting input to
uncommitted opamp.
VBOOST. Power sense connection to boost pump.
VBAT. Battery supply to boost pump.
OpAmp0+, OpAmp1+, OpAmp2+, OpAmp3+. Noninverting
input to uncommitted opamp.
VCCA. Output of analog core regulator and input to analog core.
Requires a 1 µF capacitor to VSSA. Regulator output not for
external use.
GPIO. Provides interfaces to the CPU, digital peripherals,
analog peripherals, interrupts, LCD segment drive, and
CapSense.[7]
I2C0: SCL, I2C1: SCL. I2C SCL line providing wake from sleep
on an address match. Any I/O pin can be used for I2C SCL if
wake from sleep is not required.
VCCD. Output of digital core regulator and input to digital core.
The two VCCD pins must be shorted together, with the trace
between them as short as possible, and a 1 µF capacitor to VSSD
see Power System on page 20. Regulator output not for external
use.
;
I2C0: SDA, I2C1: SDA. I2C SDA line providing wake from sleep
on an address match. Any I/O pin can be used for I2C SDA if
wake from sleep is not required.
VDDA. Supply for all analog peripherals and analog core
regulator. VDDA must be the highest voltage present on the
device. All other supply pins must be less than or equal to
Ind. Inductor connection to boost pump.
VDDA
.
kHz XTAL: Xo, kHz XTAL: Xi. 32.768-kHz crystal oscillator pin.
VDDD. Supply for all digital peripherals and digital core regulator.
MHz XTAL: Xo, MHz XTAL: Xi. 4 to 33-MHz crystal oscillator
pin.
V
DDD must be less than or equal to VDDA
.
VSSA. Ground for all analog peripherals.
nTRST. Optional JTAG Test Reset programming and debug port
connection to reset the JTAG connection.
VSSB. Ground connection for boost pump.
VSSD. Ground for all digital logic and I/O pins.
SIO. Provides interfaces to the CPU, digital peripherals and
interrupts with a programmable high threshold voltage, analog
comparator, high sink current, and high impedance state when
the device is unpowered.
VDDIO0, VDDIO1, VDDIO2, VDDIO3. Supply for I/O pins. Each
VDDIO must be tied to a valid operating voltage (1.71 V to 5.5 V),
and must be less than or equal to VDDA. If the I/O pins associated
with VDDIO0, VDDIO2 or VDDIO3 are not used then that VDDIO
should be tied to ground (VSSD or VSSA).
SWDCK. SWD Clock programming and debug port connection.
SWDIO. SWD Input and Output programming and debug port
connection.
XRES (and configurable XRES). External reset pin. Active low
with internal pull-up. In 48-pin SSOP parts, P1[2] may be
configured as XRES. In all other parts the pin is configured as a
GPIO.
TCK. JTAG Test Clock programming and debug port connection.
TDI. JTAG Test Data In programming and debug port
connection.
TDO. JTAG Test Data Out programming and debug port
connection.
4. CPU
4.1 ARM Cortex-M3 CPU
TMS. JTAG Test Mode Select programming and debug port
connection.
The CY8C55 family of devices has an ARM Cortex-M3 CPU
core. The Cortex-M3 is a low-power 32-bit three-stage pipelined
Harvard-architecture CPU that delivers 1.25 DMIPS/MHz. It is
intended for deeply embedded applications that require fast
interrupt handling features.
TRACECLK. Cortex-M3 TRACEPORT connection, clocks
TRACEDATA pins.
TRACEDATA[3:0]. Cortex-M3 TRACEPORT connections,
output data.
Notes
7. GPIOs with opamp outputs are not recommended for use with CapSense.
8. Pins are No Connect (NC) on devices without USB. NC means that the pin has no electrical connection. The pin can be left floating or tied to a supply voltage or ground.
Document Number: 001-44094 Rev. *J
Page 9 of 102
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