XC6190 Datasheet, PDF (11/21 Pages) Torex Semiconductor – Push Button Reboot Controller

■ OPERATION EXPLANATION
XC6190
Series
The XC6190 series supplies a reboot signal (TRSTB below) to the system by inputting “L” voltage into the SW1, SW2 pins for
the set time (reboot delay time) using two switches (buttons)
On the XC6190AN15xx and XC6190AC15xx, a reboot delay time (TDL below) is set by connecting a resistance (RT below)
to the RT pin.
TDL is determined by the following calculation formula:
RT(kΩ) = { TDL(s) – 0.097 } / 0.062015 * Can be set within the range 1s to 20s.
e.g.) When TDL=12.5s, RT=200kΩ
On the XC6190BN25xx and XC6190BC25xx, TDL is determined by the internal circuitry. When the TS pin is shorted to VIN,
TDL = 12.5s (TYP.), and when the TS pin is shorted to GND, TDL = 7.5s（TYP.).
Even if the TS pin voltage changes from VIN to GND while “L” voltage is input to the SW1 pin and SW2 pin, the value set
prior to the change is maintained.
VIN
VUVLOR
VUVLO
0V
VRSTB
0V
Lower than VUVLOR
(Standby mode)
TRSTB
TRSTB
Lower than VUVLO.
(Standby mode)
VSW1
0V
VSW2
0V
TDL
PUSH BUTTON
TDL
PUSH BUTTON
TDL
TDL
PUSH BUTTON
TDL
PUSH BUTTON
TDL
PUSH BUTTON
TDL
PUSH BUTTON
TDL
PUSH BUTTON
Details of each circuit part are as follows.
Fig.1＿XC6190 Timing Chart
<SW1 pin, SW2 pin>
By inputting “L” voltage into both of these pins during the TDL interval, the reboot signal is output from the RSTB pin.
Both pins are pulled up to VIN by internal resistances, and thus the pin voltage when OPEN is VIN level.
The UVLO circuit is activated by inputting “L” voltage into both the SW1 pin and SW2 pin.
<RT pin: Type A>
RT is connected to this pin to set TDL.
<TS pin: Type B>
This pin is used to set TDL. When the TS pin is shorted to VIN, TDL is set to TDL ＝ 12.5s(TYP.). When the TS pin is shorted
to GND, TDL is set to TDL ＝ 7.5s (TYP.).
Even if the TS pin voltage is changed after “L” voltage is input into both the SW1 and SW2 pins and the internal circuit
starts operation, the value set prior to the change is maintained.
(Note) The following products are under development.
XC6190AC158R-G
11/21