Datasheet

Analog Integrated Circuit Device Data

Freescale Semiconductor 96

MC34708

Functional Block Description

Type 1 and other accessories will not be affected by the RAW DATA bit. LKR and the button bits will not set when RAW DATA = 0.

The period of ADC conversion is determined by the Device Wake-up bits in the Timing Set 1 register. All other behaviors of Audio

Type 1 and other accessories will not be affected by the RAW DATA bit.

7.8.4.7 Analog and Digital Switches

The signal switches in the MC34708 are shown in Figure 26. These switches are controlled by the identification result when the

Manual S/W = 1, and by the Manual SW/Result register, when the Manual S/W = 0 is in Active mode. The Switch_Open bit

overrides the switch configuration. When the Switch_Open bit is 0, all switches are turned off. The switches for the SPK_L and

SPK_R are capable of passing signals of 1.5

V, referencing to the GND pin voltage. The SPK_L and SPK_R pins are pulled

down to GND via a 100 k resistor respectively, as shown in Figure 26. When the switches are configured automatically by the

identification result, the configuration of the switches vs. the device type is shown in Table 93.

When detachment of an accessory is detected, the MC34708 will return to Standby mode. In Standby mode, regardless of the

Manual S/W = 1 or Manual S/W = 0 state, all signal switches and are off in the Standby mode. The OUT-to-ground FET is turned

on whenever the FET_ON bit is '0'.

Figure 26. Analog and Digital Switches

SPK_R

SPK_L

MIC

VBUS

RxD

TxD

D+

D-

SW2

SW1

SW3

SW4

SW6

SW7

SW5

VUSB

LDO

VINUSB

MOTG