MT7697 datasheet(17/81 Pages) ETC2

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MT7697

Internet-of-Things Wireless Connectivity

Page 17 of 81

This document contains information that is proprietary to MediaTek Inc. (“MediaTek”) and/or its licensor(s).

Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.

2.3

Clock and Reset Generation

2.3.1

Clock

MT7697 connects to the XTAL or external clock source as the single clock source of the whole system.

The XTAL oscillator can support the XTAL frequencies from among 40, 26, and 52MHz.

XTAL

oscillator

f = 40/

26/52MHz

PLL1

DIV

PLL2

DIV 1

DIV 3

DIV 12

WF_RXADC_CLK

80MHz

WF_TXDAC_CLK

960MHz

WF_DIG_CLK

320MHz

32MHz

960MHz

DIV 5

SPI CLOCK

FLASH CLOCK

I2C CLOCK

UART CLOCK

XPLL (Audio Frac-N)

±1% (0.01% granularity)

I2S_MCLK

16MHz

AUXADC CLOCK

PWM CLOCK

DIV 13

2-32 step 0.5

1-160MHz

1-192MHz

832MHz

640MHz

RF PLL

WF RF

DIV 5

2-32 step 0.5

XTAL CLOCK

DIV

PMU

BGCLK

(25KHz)

F32K CLOCK

2MHz

DIV

DIV options:

480, 240, 120, 60,

30, 20, 15, 12, 10

9.6, 19.2, 38.4, 115.2KHz

DIV

DIV options: 2708,1354,677,226

DIV

50, 100, 200, 400KHz

DIV options: 520,260,130,65

N9 CLOCK

160MHz

DIV 8

DIV 794

CM4 CLOCK

192MHz

120MHz

250, 500KHz

1, 2, 4, 6, 8, 10, 12MHz

DIV

64MHz

DIV

16MHz

RF power domain

AON power domain

CM4 power domain

DIV 2

PMU power domain

830081B4[14:13]

80021114[21:20]

81021170[12:8]

830081B0[2:0]

830081B0[15:14]

830081B0[9:4]

81021100[2:0]

81021100[9:4]

830081B4[7:3]

1-32 step 1

81021100[15:14]

81021100[17:16]

81021100[31:21]

830081B4[17]

830081B4[23:19]

24000028[27:16]

830B0000[27:24]

830081B4[12:8]

8300A600[2:1]

83090244[15:0] 83090248[15:0]

830A0244[15:0]830A0248[15:0]

Figure 2-3. Clock Generation Block Diagram



PLL1 is used to generate the clock sources for Bluetooth and PLL2.



PLL2 is used to generate the clock sources for Wi-Fi, N9 core, Cortex M4 core, and bus fabric.



XPLL is used to generate the clock sources for I2S (for external audio CODEC).

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