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DS20006363D-page 27

SY75608/612

6.0

REGISTER MAP

The device is controlled by accessing registers through the serial interface. The following table provides a summary of

the registers available for the configuration of the device. The default settings can be modified via factory programmable

OTP memory (64 bit in total).

TABLE 6-1:

REGISTER MAP

Address

I2C A[6:0]

Hex (0x)

Name

Data D[7:0]

00

XTALBG

xtal_buf_gain[4:0]

01

Reserved

Leave as default

02

XTALLC

xtal_load_cap[7:0]

03

XTALNR

xtal_normal_run

04

INSEL

input_select[1:0]

05

OUTDSTATE0

out_disable_state[7:0] (differential output OUT3, OUT2, OUT1, OUT0)

06

OUTDSTATE1

out_disable_state[15:8] (differential output OUT7, OUT6, OUT5, OUT4)

07

OUTDSTATE2

out_disable_state[23:16] (differential output OUT11, OUT10, OUT9, OUT8),

SY75612 Only

08

OUTEN0

outen[7:0]

09

OUTEN1

outen[15:8], SY75612 Only

0A

DEVADDR

dev_addr[2:0]

0B

DEVICEID

Device Identification

0D

IN1_BUFF_CTRL Differential Input 1 Control

TABLE 6-2:

DETAILED REGISTER MAP

Bit

Name

Description

Type

Reset

XTAL Buffer Gain - XTALBG (0x00)

7:5

Unused

Leave as default

R/W

000

4:0

xtal_buf_gain[4:0]

Programs crystal buffer (inverting amplifier) gain by

selecting number of parallel gain elements:

Each gain value has associated series resistor as

shown below:

R/W

00100

Note 1

xtal_buf_gain[4:0] Number of Parallel

XO Amplifiers

Series Resistance

0

0

Open circuit

1

1

550Ω

2

2

550Ω

3

3

550Ω

4

4

150Ω

8

4

0Ω

16

8

0Ω

24

12

0Ω

Only values 0, 1, 2, 3, 4, 8, 16 and 24 are allowed

values to be written to xtal_buf_gain[4:0].

All the other values are reserved.