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CP2501DK

P1-P3P4-P6P7-P9P10-P12P13-P14
CP2501-DK
Rev. 0.1 7
Figure 3. CP250x Motherboard with Default Shorting Block Positions
Figure 4. CP2501 Development Daughter Board
U1
F326
CP250x-MB
SILICON LABS
www.silabs.com
P5
J3
+3VD
VDD_PWR
VDD_DEBUG
RESET
TB3
TB1
TB2
P3
J15
VPP
J7
J13
J1
J2
P2
P1
D10
D11
D12
SPI_SCLK
SPI_MISO
SPI_MOSI
SPI_NSS
GND
UART_RX
UART_TX
GND
SMBUS_SDA
SMBUS_SCL
GND
PWR
H1
H2
GPIO7-0
GPIO15-8
U1
CP
2501
CP2501-GM EDB
SILICON LABS
www.silabs.com
P3
J1
VDD
VREGIN
VBUS
CP2501-DK
8 Rev. 0.1
5.1. Switch and LEDs
The RESET switch is connected to the RST pin of the CP250x. Pressing RESET puts the device into its hardware-
reset state.
Four LEDs are also provided on the motherboard. The red LED labeled “PWR” (D4), indicates a power connection
to the motherboard. The green LED labeled “RUN” (D10) turns on when the debug circuitry is in a running state;
the red LED labeled “STOP” (D11) turns on when the debug circuitry is in a halted state, and the orange LED
labeled “DEBUG PWR” (D12) indicates whether the debug adapter circuit is being powered through P5's USB
connector. Table 2 lists the port pins and headers corresponding to the switch and LEDs.
5.2. Power Supply Headers (P3, J3, and J7)
The main power supply of the motherboard, which is used to power the daughter board, can be provided by either
the USB debug device’s on-chip voltage regulator or P3 and its associated circuitry. To select a power supply, place
a shorting block on J3 across the appropriate pin pair, as shown in Figure 5. To connect the main power supply to
an attached daughter board, place a shorting block across J7.
Notes:
1. Only two of the pins on the J3 header should be connected at any one time
2. To use the USB debug device’s voltage regulator as the board's power supply, a USB cable must be
connected to P5, and the DEBUG PWR LED (D12) must be on.
Figure 5. J3 and J7 Shorting Block Configuration for Power Options
Table 2. Motherboard LED and Switch Descriptions
Description Component Name I/O Header
RESET SW3 Daughter Board’s RST/C2CK None
Red LED labeled "PWR" D4 Daughter Board’s VDD J3, J7
Green LED labeled "RUN" D10 Debug Adapter Signal None
Red LED labeled "STOP" D11 Debug Adapter Signal None
Orange LED labeled "DEBUG PWR" D12 Debug Adapter Signal None
J3
+3.3V Regulator Power
(From P3)
Debug Circuit Power
(From USB at P5)
VDD_PWR
VDD_CP250x
J3
VDD_PWR
+3VD
VDD_DEBUG
VDD_PWR
+3VD
VDD_DEBUG
J7
VDD_PWR
VDD_CP250x
J7
CP2501-DK
Rev. 0.1 9
5.3. USB Debug Device (DEBUG/P5)
A universal serial bus (USB) connector (P5) provides the onboard debug and programming interface. The debug/
programming MCU and associated circuitry are powered through the USB connector, which can also supply the
rest of the motherboard by routing the USB debug device’s power through J3. The USB debug device also
provides a data communications interface that can be used when the debug adapter is not debugging or
programming a CP250x device.
5.4. UART Communications Interfaces (TB1, J2)
The CP250x Motherboard provides UART to USB communications interfaces through both the TB1 interface and
the communications interface of the USB Debug Adapter. Any external touch screen module using the UART
interface can connect to the CP250x through either header.
The USB debug device’s communications interface connects to a PC through P5. Access to the USB debug
device’s communications interface is provided by the Windows program called “ToolStick Terminal”, which is
available for download for free from the Silicon Laboratories website. See the ToolStick Terminal help file for
information on how to use ToolStick Terminal.
The CP250x Motherboard routes the CP250x’s UART_TX and UART_RX pins to J2, where those signals can be
optionally connected to TB1 header.
5.5. SMBus Communications Interface (TB2, J1)
The CP250x Motherboard connects the SMBus interface pins SMBUS_SDA and SMBUS_SCL to the TB2 header.
These two pins can be pulled up to the VIO net through the two pull-up resistors, R1 and R2, by adding the shorting
block to the J1 header. Only one set of pull-up resistors is required on any SMBus network. The shorting block on
the J1 header should be removed if the pull-up resistors are already present on the network.
The R1 and R2 pull-up resistors are 1K resistors and are located on the backside of the mother board near the TB2
header.
5.6. SPI Communications Interfaces (TB3)
The CP250x Motherboard connects the SPI interface pins, SPI_SCLK, SPI_MISO, SPI_MOSI, and SPI_NSS to
the TB3 header.
5.7. GPIO Interfaces (H1, H2)
The CP2501 devices support 16 GPIO pins (GPIO0 through GPIO15). These GPIO pins are connected to the two
headers H1 and H2.
5.8. Daughter Board (P3, J1)
The P3 header on the daughter board is the USB connection for the CP2501. The J3 header selects how the
CP2501 on the daughter board is powered. If a shorting block is connected to J1[VBUS-VREGIN], the CP2501 is
powered from the P3 USB connector. If a shorting block is connected to J1[VDD-VREGIN], the CP2501 is powered
from the motherboard.
P1-P3P4-P6P7-P9P10-P12P13-P14

CP2501DK

Mfr. #:
Buy CP2501DK
Manufacturer:
Silicon Labs
Description:
Touch Sensor Development Tools CP2501 development kit
Lifecycle:
New from this manufacturer.
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