XC6121_1 Datasheet, PDF (13/23 Pages) Torex Semiconductor – Voltage Detector with Watchdog Function and ON/OFF Control (VDF=1.6V~5.0V)

XC6121/XC6122/XC6123/XC6124
Series
˙PIN LOGIC CONDITIONS
PIN NAME LOGIC
H
VIN
L
H
EN/ENB
L
CONDITIONS
VIN>VDFL+VHYS
VIN<VDFL
EN/ENB>1.30V
EN/ENB<0.35V
PIN NAME
WD
LOGIC
H
L
LË H
HË L
CONDITIONS
The state maintaining WD>VWDH
for more than TWD
The state maintaining WD<VWDL
for more than TWD
VWDL→VWDH, 300nsʽTWDINʽTWD
VWDH→VWDL, 300nsʽTWDINʽTWD
NOTE:
V_DFL: Detect Voltage
V_HYS: Hysteresis Range
V_WDH: WD High Level Voltage
V_WDL: WD Low Level Voltage
T_WDIN: WD Pulse Width
T_WD: WD Timeout Period
For the details of each parameter, please see the electrical characteristics.
˙FUNCTION CHART
VIN
XC6121/XC6122 XC6123/XC6124
WD
EN
ENB
H
H
H
L
L
OPEN
L˱H
H
L
L
H
L
*1
RESETB (*2)
Repeating detect and release (HË LË H)
H
H
L
NOTE:
*1: Including all logics of the WD (WD=H, L, OPEN, HË L, LË H).
*2: When the RESETB is High, the circuit is in the release state.
When the RESETB is Low, the circuit is in the detection state.
*3: V_IN=L and EN/ENB=H can not be combined because the rated input voltage of the EN/ENB pin is Vss-0.3V to V_IN+0.3V.
*4: The RESETB pin becomes indefinite operation while 0.35V<EN/ENB<1.3V.
*5: The EN pin of the XC6121 series is not internally pulled up. When using the watchdog function, please drive the
EN pin in high level. The EN pin of the XC6122 series is internally pulled up. The watchdog function can be
used even the EN pin left open. The ENB pin of the XC6123 series is not internally pulled down. When using
the watchdog function, please drive the ENB pin in low level. The ENB pin of the XC6124 series is internally
pulled up. The watchdog function can be used even the ENB pin left open.
13/23