EPC635 datasheet(90/97 Pages) EPC

90 / 97 page

8.7.19. DLL_control

DLL_control

DLL control

0xAE

Bit No.

Bit name

reserved

dll_ctrl

_ext_en

dll_rate

_cnt_rst

dll_ctrl

_ext

dll_fb_pol

dll_bypass

Operation

Default

0x00

DLL Control:

dll_ctrl_ext_en:

DLL, LED driver, feedback amplifier enable during manual control for delay locking operation

(i.e. Modulator control is completely bypassed)

0: disable

1: enable

IMPORTANT

Is dll_ctrl_ext_en = 1 for manual control, the LED pin toggles continuously until this bit is cleared. If the external

LED driver circuit is not designed for continuous operation, it might cause permanent damage.

Note 1:

When dll_ctrl_ext = 1, DLL_filter_control.dll_filter_ctrl_s1_sel and

DLL_filter_control.dll_filter_ctrl_s2_sel functions are suppressed.

Note 2:

When DLL is operated manually, application SW must set dll_ctrl_ext_en = 0 while keeping dll_ctrl_ext

= 1 to freeze the locked value before starting frame acquisition.

dll_rate_cnt_rst:

DLL measurement rate counter reset

0: normal

1: reset (auto cleared)

dll_ctrl_ext:

Manual control of the delay line using DLL_*ctrl_ext* registers

0: normal

1: manual

dll_fb_pol:

Inverts the polarity of signal at LEDFB pin

0: normal

1: inverted

Note:

dll_fb_pol must be set with respect to LED_driver.led_inv_en value and the external LED/LD circuit

feedback point connected to the LEDFB input (external LED/LD circuit can be inverting or non-inverting

depending on the application).

dll_bypass:

Bypass control of DLL for system delay compensation

0: normal

1. bypass

8.7.20. I2C_TCMI_

I2C_address

I2C_TCMI_register, SEG4 *: Address

0xCA

Bit No.

Bit name

reserved

i2c_dev_adr(A6..A2)

reserved

i2c_dev_adr(A1..A0)

Operation

Default

0x20

i2c_dev_adr(A6..A2):

I2C device address A6 … A2 of 7-bit I2C device address.

Programmable via direct access from I2C or from EEPROM during start-up, followed by an I2C general call “De-

vice address reload” to take it into effect.

i2c_dev_adr(A1..A0):

I2C device address A1, A0 of 7-bit I2C device address.

Programmable only during reset via strap pins using external pull-up resistors.

Characteristics subject to change without notice

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