13892 datasheet(112/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

112

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

CONNECTIVITY

DETECTION COMPARATORS

VBUS detection and qualification is accomplished with two comparators, detailed in Table 101. Comparator results are used

to generate associated interrupts, and sense and masking bits are available through SPI (refer to SPI Bitmap). Comparator

thresholds are specified for the minimum detect levels, and bits can be used in combination to qualify a VBUS window. Events

are communicated via (INT pin) interrupts and managed through SPI registers to allow the application processor to turn off the

PHY.

As described in Battery Interface and Control, the battery charger system is designed to work with the USB system physical

connector. The power input is then brought into an end product on the VBUS pin of the USB connector. For fault condition

robustness, VBUS over-voltage protection is included to protect the system and flag an over-voltage situation to the processor

via the USBOVI interrupt.

ID DETECTOR

The ID detector is primarily used to determine if a mini-A or mini-B style plug has been inserted into a mini-AB style receptacle

on the application. However, it is also supports two additional modes which are outside of the USB standards: a factory mode

and a non-USB accessory mode. 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. There are also dedicated maskable interrupts for each UID condition as well.

The ID detector is based on an on-chip pull-up controlled by the IDPUCNTRL bit. If set high the pull-up is a current source, if

set low it is a resistor. ID100KPU switches in an additional pull-up from VCORE to UID (independent of IDPUCNTRL). The UID

voltage can be read out via the ADC channel ADIN7, see ADC Subsystem.

The ID detector thresholds are listed in Table 102. Further interpretations of non-USB accessory detection may be made for

custom vendor applications by evaluation of the ADIN7 conversion reading.

Table 101. USB Detect Specifications

Parameter

Condition

Min

Typ

Max

Units

VBUSValid Comparator trip level

4.4

4.65

VBUSValid trip delay

Including the USBI debounce

Rising trip delay

Falling trip delay

8.0

BVALID Comparator Threshold

Rising and falling edge

4.0

4.4

BVALID Trip Delay

Rising trip delay for turn on event

Falling trip delay for turn on event

8.0

Over-voltage Protection Level

Rising and falling edge

5.6

6.0

Over-voltage Protection Disconnect Time

1.0

μs

Table 102. ID Detection Thresholds

UID Pin External

Connection

UID Pin Voltage

IDFLOATS

IDGNDS

IDFACTORYS

Accessory

Resistor to Ground

0.18 * VCORE < UID

< 0.77 * VCORE

Non-USB accessory is attached (per CEA-

936-A spec)

Grounded

0 < UID < 0.12 *

VCORE

A type plug (USB Default Slave) is

attached (per CEA-936-A spec)

Floating

0.89 * VCORE < UID

< VCORE

B type plug (USB Host, OTG default

master or no device) is attached.

Voltage Applied

3.6V < UID (76)

Factory mode

Notes

76.

UID maximum voltage is 5.25 V

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