ADM00310 Microchip Technology, ADM00310 Datasheet - Page 7

• Manufacturer Part Number: ADM00310
• Description: BOARD EVAL FOR MCP3903 AFE
• Manufacturer: Microchip Technology
• Series: -r

Specifications of ADM00310

• Design Resources: MCP3903 Eval Brd BOM MCP3903 Eval Brd Schematic
• Main Purpose: Interface, Analog Front End (AFE)
• Embedded: Yes, MCU, 16-Bit
• Utilized Ic / Part: MCP3903, PIC24F, PIC24H, dsPIC33, MCP2200
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FIGURE 1-4:
1.5.2.3
Typically, many embedded applications are using 3.3V
power supplies. When such an option is available in the
target system, MCP2200 can be powered up from the
existing 3.3V power supply rail. The typical connections
for MCP2200 are shown in
In this example MCP2200 has both V
tied to the 3.3V rail. These tied connections disable the
internal USB transceiver LDO of the MCP2200 to reg-
ulate the power supply on V
quence is that the ‘1’ logical level on the GPIO pins will
be at the 3.3V level, in accordance with the variations
specified in
 2011 Microchip Technology Inc.
5V (USB Bus)
or external
power supply
Section 3.1, DC
3.3V Self Powered
V
V
D+
D-
USB
DD
TYPICAL POWER SUPPLY
OPTION USING THE 5V
PROVIDED BY THE USB
Figure
Characteristics.
USB
pin. Another conse-
Transceiver
1-5.
OUT
DD
IN
USB
LDO
3.3V
and V
USB
lines
FIGURE 1-5:
1.6
The GPIO Module is a standard 8-bit I/O port.
1.6.1
The pins can be configured as:
• GPIO – individually configurable general purpose
• SSPND – USB Suspend state
• USBCFG – indicates USB configuration status
• RxLED – indicates USB receive traffic
• TxLED – indicates USB transmit traffic
1.6.1.1
The SSPND pin (if enabled) reflects the USB state
(Suspend/Resume). The pin is active ‘low’ when the
Suspend state has been issued by the USB host.
Likewise, the pin drives ‘high’ after the Resume state is
achieved.
This pin allows the application to go into Low Power
mode when USB communication is suspended, and
switches to a full active state when USB activity is
resumed.
1.6.1.2
The USBCFG pin (if enabled) starts out ‘low’ during
power-up or after Reset, and goes ‘high’ after the
device successfully configures to the USB. The pin will
go ‘low’ when in Suspend mode and ‘high’ when the
USB resumes.
5V (USB Bus)
or external
power supply
input or output
GPIO Module
CONFIGURABLE PIN FUNCTIONS
SSPND Pin Function
USBCFG Pin Function
External
3.3V
LDO
USING AN EXTERNALLY
PROVIDED 3.3V POWER
SUPPLY
MCP2200
V
V
D+
USB
D-
DD
DS22228B-page 7
Transceiver
OUT
IN
LDO
3.3V
USB