EPC660 Datasheet, PDF (101/116 Pages) Espros Photonics corp – 3D TOF Imager 320 x 240 Pixel

8.7.6. LED_driver
LED_driver
Bit No.
Bit name
Operation
Default
7
6
led_drv_sel
1
1
5
led2_en
0
Mod./demod. registers, SEG1 *: LED driver
4
3
2
1
led_on
reserved led_drv_en led_inv_en
RW
0
0
1
0
0xC4
0x90
0
led_ssr_en
0
led_drv_sel:
LED driver output max. current select e.g. for LED current 200mA ≙ 100%
00: 33%
01: 46%
10: 64%
11: 100%
0.7
0.6
I_LED led_drv_sel = 11
I_LED led_drv_sel = 01
0.5
I_LED led_drv_sel = 10
I_LED led_drv_sel = 00
0.4
0.3
0.2
0.1
led2_en:
led_on:
led_drv_en:
led_inv_en:
led_ssr_en:
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
VDD_LED (V)
Figure 81: Output characteristic ILED versus VDDLED
Refer for maximum values of VDDLED and ILED to Table 1.
LED2 pin enable
0: disabled (i.e. 0V)
1: enabled
LED/LD permanently on (DC) (torch function)
0: off
1: on
LED driver internal power enable (independent of the modulator)
0: disable
1: enable
LED signal inversion. Inversion of the output levels of the LED signal.
0: disable (signal is active when pin LED = 0, VSSLED)
1: enable (signal is active when pin LED = 1, open-drain)
Note: When led_inv_en = 0: It can directly sink the LED turn-on current without additional external driver.
When led_inv_en = 1: It needs an external pull-up resistor (open-drain) to drive the inverted value for the
external LED drive circuitry.
LED slow slew rate enable.
0: disable
1: enable
© 2017 ESPROS Photonics Corporation
Characteristics subject to change without notice
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Datasheet_epc660-V1.09
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