Datasheet

Analog Integrated Circuit Device Data

87 Freescale Semiconductor

MC34708

Functional Block Description

7.8.4 Mini/Micro USB Switch

The MC34708 is able to multiplex the 5 pins to support UART and high-speed USB2.0 data communications, a mono/stereo-

audio/microphone headset, or other accessories. To identify what accessory is plugged into the Mini or Micro-USB connector,

the MC34708 supports various detection mechanisms, including the VBUS detection and ID detection. A highly accurate 5-bit

ADC is offered to distinguish the 32 levels of ID resistance, and to identify the button pressed in a cord remote control, while an

Audio Type 1 cable is attached. After identifying the accessory attached, the MC34708 configures itself to support the accessory

and interrupts a host via the INT pin. The processor can evaluate what caused the interrupt via the SPI/I

C bus. The MC34708

is also able to identify some non-supported accessories, such as video cables, phone-powered devices, etc.

Table 84. General Purpose LED Drivers Period Control

CHRGLEDxPER[1:0] Repetition Rate Units

00 256 Hz

01 8.0 Hz

10 1.0 Hz

11 1/2 Hz

Table 85. LED Driver Electrical Specifications

Characteristics noted under conditions BP = 3.6 V, - 40 C  T

 85 C, unless otherwise noted. Typical values at BP = 3.6 V

and T

= 25 °C under nominal conditions, unless otherwise noted.

Symbol Characteristic Min Typ Max Unit Notes

General Purpose LED Driver

Absolute Accuracy

- - 30 %

Matching - At 1.0 V, 12 mA

- - 4.0 %

Leakage - CHRGLEDxDC [5:0]=000000

- - 1.0 A