L99DZ80EP datasheet(43/68 Pages) STMICROELECTRONICS

tên linh kiện	L99DZ80EP

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L99DZ80EP

Application information

If the electrochrome element is connected between the pins ECV and ECFD instead

between ECV and ground, a negative voltage can be applied to the device by pulling ECFD

to a higher value than ECV, which is connected to ground by a 1.6

 low-side switch. In this

mode the voltage at pin ECFD is controlled to the target value defined by the register

EC<5:0>. This is done using an on-chip source-follower transistor (see Figure 21 for

details). The negative discharge is enabled by setting bit ECND to ‘1’.

When programming the ECFDLS driver to on-state, the voltage at pin ECFD is pulled to

ground by a 1.6

 low-side switch until the voltage at pin ECFD is less than dV

ECFDhi higher

than the target voltage (fast discharge).

During normal (positive) voltage control the low side driver at pin ECFD must be switched

on to connect the electrochrome element to ground.

Pin ECDR is pulled resistively (RECDRDIS) to ground while not in electrochrome mode.

Figure 20. Electrochrome mirror driver with mirror referenced to ground

L99DZ80EP bảng dữ liệu(PDF) 43 Page - STMicroelectronics