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BD2802GU
Technical Note
● Description of other operations
1. Reset
There are two types of reset: software reset and hardware reset.
(1) Software reset
- Setting the register (SFTRST) to “1” causes all the registers to be initialized.
- The registers subject to software reset automatically return to zero (Auto Return 0).
(2) Hardware reset
- Changing the RESETB terminal setting from “H” to “L” causes a state subject to hardware reset.
- Attempting hardware reset causes the states of all registers and output terminals to be initialized to their initial
values, so that address reception is entirely stopped.
- Attempting reset in the hardware reset state causes the RESETB terminal state to change from “L” to “H” and vice versa.
- The RESETB terminal is provided with a filter circuit and a duration of 5μs or less with the terminal set to “L” is not
recognized as hardware reset.
(3) Reset sequence
- When hardware reset is attempted during software reset, software reset is already cleared when hardware reset is
cleared (because the software reset initial value is 0).
2. Thermal shutdown
The thermal shutdown is effective for LED and OSC portions.
The thermal shutdown function is activated when the detected temperature is approx. 195 ? C.
The detected temperature has a hysteresis and the detection cancel temperature is approx. 175 ? C (reference value in design).
3. I/O portion
While the RESETB terminal is in “L” state, no input signal is propagated to the IC logic portion because SDA and SCL
input buffer operations are all stopped.
When RESETB=L, output is fixed at “H.”
SCL
Level shifter
(SDA)
EN
Logic
RESETB
Special care should be taken because a current path may be formed via a terminal protection diode, depending on an I/O
power-on sequence or an input level.
4. Power on/off sequence
Voltage shall be applied as follows at driver activation. When a delay element is connected to a VIO voltage source
and a reset cancel signal is input to the RESETB terminal, special care should be taken to the rising time of VIO voltage
to delay the RESETB signal without fail.
VBAT
T VBATOFF
VIO
T R STB=m in 0.1m s
T R ST=m in 0.1m s
RESETB
T AC SS=m in 0.1m s
Register 御
レ ジスタ制 control
不 可
Register control disabled
可 能
Register control enabled
不 可
Register control disabled
5. Terminating the unused terminals
Be sure to set the test terminals and unused terminals as summarized in the following table.In addition, refer to the
preceding equivalent circuit and terminate the above terminals in a way that no problem occurs during actual use.
T1, T2, T3, T4 Test input terminals. Short-circuit these terminals to GND.
LED terminals not to be used
Short-circuit these terminals to GND.
In this case, don’t set the registers related to LEDs not to be used.
RGB1CNT, RGB2CNT Short-circuit these terminals to GND.(Built-in pull-down resistance)
CLKIO
ADDSEL
Short-circuit this terminal to GND.(Built-in pull-down resistance)
Be sure to short-circuit this terminal to VBAT or GND.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
23/27
2011.04 - Rev.A
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