IS2064 datasheet(21/74 Pages) MICROCHIP

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Advance Information

DS60001409A - Page 21

IS2062/64

4.0

MICROCONTROLLER

A microcontroller is built into an SoC to execute the

Bluetooth protocols. It operates from 16 MHz to higher

frequencies where the firmware can dynamically adjust

the trade-off between the computing power and the

power consumption. In ROM version, the MCU firm-

ware is hard-wired to minimize power consumption and

to save the external Flash cost.

4.1

Memory

There are sufficient ROM and RAM to fulfill the require-

ment of processor, in which a synchronous single port

RAM interface is used. The register bank, dedicated

single port memory and Flash memory are connected

to the processor bus. The processor coordinates all the

link control procedures and data movement using a set

of pointer registers.

4.2

External Reset

The IS2062/64 SoC provides a watchdog timer (WDT)

to Reset the SoC. It has an integrated Power-on Reset

(POR) circuit that resets all circuits to a known

Power-on state. This action can also be driven by an

external Reset signal which is used to control the

device externally by forcing it into a POR state. The

RST_N signal input is active-low and no connection is

required in most of the applications.

4.3

Reference Clock

The IS2062/64 SoC is composed of an integrated crys-

tal oscillation function that uses a 16 MHz, ±10 ppm

external crystal and two specified loading capacitors to

provide a high quality system reference timer source.

This feature is typically used to remove the initial toler-

ance frequency errors associated with the crystal and

its equivalent loading capacitance in mass production.

Frequency trim is achieved by adjusting the crystal

loading capacitance through the on-chip trim capaci-

tors (Ctrim).

The value of trimming capacitance is 200 fF

(200x10-15 F) per LSb at 5-bit word and the overall

adjustable clock frequency is ±50 kHz (based on crystal

with load capacitance, CL spec = 9 pF). Figure 4-1 illus-

trates the crystal connection of the IS2062/64 SoC with

two capacitors.

FIGURE 4-1:

CRYSTAL CONNECTION

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