VD5377 datasheet(25/88 Pages) STMICROELECTRONICS

部件名	VD5377

功能描述	Ultra-low power motion sensor for optical finger navigation (OFN)

PDF	88 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

25 / 88 page

Doc ID 022952 Rev 2

25/88

VD5377

I/O description

5.2

LED_OUT (tracking LED) and GPIO0

LED_OUT is controlled by a 3-bit current DAC (0x3 ANALOG_CTRL2 bits [6:4]) capable of

driving up to 14 mA (current sink). Where higher power output is required, an external LED

driver can be used controlled by GPIO0 (0x3 ANALOG_CTRL2 bit7 and 0xd GPIO_GPIO0

bit 4). Figure 11 shows the two LED drive options. LED pulse timing is controlled

automatically (see Figure 12). GPIO0 can also be used as a general purpose I/O and is

configured using register 0xd GPIO_GPIO0 bit 4. A typical configuration of a GPIO is shown

in Figure 13 on page 27.

Figure 11. LED drive options

Figure 12. LED control

LED_OUT

LED driven by internal DAC

VTOP

VD5377

GPIO0

LED with external driver

VTOP

VD5377

LED

Short

Exposure

Long

Exposure

1 Frame = 1ms (1kHz) / 500µs (2kHz) / 250µs (4kHz)

86 µs (Max)

VD5377 数据表(PDF) 25 Page - STMicroelectronics