FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
USB
UID
This pin identifies if a mini-A or mini-B style plug has been connected to the application. The state of the ID detection can be
read via the SPI, to poll dedicated sense bits for a floating, grounded, or factory mode condition on the UID pin.
UVBUS
1. USB transceiver cable interface.
2. OTG supply output.
When SWBST is configured to supply the UVBUS pin in OTG mode, the feedback will switch to sense the UVBUS pin instead
of the SWBSTFB pin.
VUSB
This is the regulator used to provide a voltage to an external USB transceiver IC.
VINUSB
Input option for VUSB; supplied by SWBST. This pin is internally connected to the UVBUS pin for OTG mode operation (for
more details about OTG mode).
Note: When VUSBIN = 1, UVBUS will be connected via internal switches to VINUSB and incur some current drain on that pin,
as much as 270 μA maximum, so care must be taken to disable this path and set this SPI bit (VUSBIN) to 0 to minimize current
drain, even if SWBST and/or VUSB are disabled.
VBUSEN
External VBUS enable pin for the OTG supply. VBUS is defined as the power rail of the USB cable (+5.0 V).
A TO D CONVERTER
Note: The ADIN5/6/7 inputs must not exceed BP.
ADIN5
ADC generic input channel 5. ADIN5 may be used as a general purpose unscaled input, but in a typical application, ADIN5 is
used to read out the battery pack thermistor. The thermistor must be biased with an external pull-up to a voltage rail greater than
the ADC input range. In order to save current when the thermistor reading is not required, it can be biased from one of the general
purpose IOs such as GPO1. A resistor divider network should assure the resulting voltage falls within the ADC input range, in
particular when the thermistor check function is used.
ADIN6
ADC generic input channel 6. ADIN6 may be used as a general purpose unscaled input, but in a typical application, the PA
thermistor is connected here.
ADIN7
ADC generic input channel 7, group 1. ADIN7 may be used as a general purpose unscaled input or as a divide by 2 scaled
input. In a typical application, an ambient light sensor is connected here. A second general purpose input ADIN7B is available
on channel 7. This input is muxed on the GPO4 pin. In the application, a second ambient light sensor is supposed to be connected
here.
TSX1 AND TSX2, TSY1 AND TSY2 - Note: The TS[xy] [12] inputs must not exceed BP or VCORE.
Touch Screen Interfaces X1 and X2, Y1 and Y2. The touch screen X plate is connected to TSX1 and TSX2, while the Y plate
is connected to Y1 and Y2. In inactive mode, these pins can also be used as general purpose ADC inputs. They are respectively
mapped on ADC channels 4, 5, 6, and 7. In interrupt mode, a voltage is applied to the X-plate (TSX2) via a weak current source
to VCORE, while the Y-plate is connected to ground (TSY1).
13892
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
FREESCALE [ Freescale ]
