Datasheet

PIC24FJ256GB210 FAMILY
DS39975A-page 238  2010 Microchip Technology Inc.
EQUATION 18-1: ESTIMATING USB TRANSCEIVER CURRENT CONSUMPTION
Legend: VUSB – Voltage applied to the VUSB pin in volts (3.0V to 3.6V).
P
ZERO – Percentage (in decimal) of the IN traffic bits sent by the PIC
®
microcontroller that are a value
of ‘0’.
P
IN – Percentage (in decimal) of total bus bandwidth that is used for IN traffic.
L
CABLE – Length (in meters) of the USB cable. The “USB 2.0 OTG Specification” requires that
full-speed applications use cables no longer than 5m.
IPULLUP – Current which the nominal, 1.5 k pull-up resistor (when enabled) must supply to the USB
cable.
40 mA • VUSB • PZERO • PIN • LCABLE
IXCVR =
3.3V • 5m
+ I
PULLUP