Figure 3-42. Detailed Low-Frequency Transmit/Receive Paths; Figure 3-43. Chip Power-Up/Power-Down Sequence (Exernal Input/Output Shown) - Motorola APX 3000 Detailed Service Manual

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Table of Contents

Bluetooth Power

Our Bluetooth IC operates from a 3.6V (U6504, VBAT) switching regulator located on the Main board

to supply the Bluetooth IC core and a 1.85V (U6508, VDDS) supply for the I/O. It has a shutdown

(U2415 pin L3) that must be high for operation to work. The power-up/down sequence required for

operation is shown in

Partial Current Tree

TCXO_CLK_REQ

Figure 3-42. Detailed Low-Frequency Transmit/Receive Paths

Analog PORz (~135 RTC cycles) +

Efuse shifting (~1000 RTC cycles)

Max time from clock request/

voltage to TCXO_CLK availability

Theory of Operation