STC6344Z [ETC]

UP Supervisor Circuits; UP监控电路
STC6344Z
型号: STC6344Z
厂家: ETC    ETC
描述:

UP Supervisor Circuits
UP监控电路

监控
文件: 总13页 (文件大小:110K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Features  
Introduction  
• Precision supply-voltage monitor  
- 4.63V (STC8xxL, STC634xL)  
The STCxxx family microprocessor (µP)  
supervisory circuits are targeted to improve reliability  
and accuracy of power-supply circuitry in µP systems.  
These devices reduce the complexity and number of  
components required to monitor power-supply and  
battery functions.  
- 4.38V (STC8xxM, STC634xM)  
- 3.08V (STC8xxT, STC634xT)  
- 2.93V (STC8xxS, STC634xS)  
- 2.63V (STC8xxR, STC634xR)  
- 2.32V (STC8xxZ, STC634xZ)  
The main functions are:  
- 2.20V (STC8xxY, STC634xY)  
• 200ms reset pulse width  
1. Asserting reset output during power-up, power-  
down and brownout conditions for µP system;  
2. Detecting power failure or low-battery conditions  
with a 1.25V threshold detector;  
3. Watchdog functions;  
• Debounced CMOS-compatible manual-reset input  
(811, 812, 823, 825, 6342-6344)  
• Reset Output Signal for Watchdog and Power  
Abnormal, Manual Reset  
4. Manual reset.  
• Reset Push-Pull output (STC809,811,823,  
824,825,6342,6345)  
Applications  
• Reset Open-Drain output (STC803/6343)  
Voltage monitor for power-fail or low battery warning  
• Guaranteed RESET/RESET valid at VCC = 1.0V  
• Power-supply circuitry in µP systems  
Ordering Information  
RESET  
output  
(push-pull)  
Power Fail  
Detector  
(1.25V)  
RESET output  
Manual Reset  
Input  
Watchdog  
Input  
Part No.  
Package  
Push-Pull  
Open-Drain  
-
-
STC803X  
STC809X  
STC810X  
STC811X  
STC812X  
STC823X  
STC824X  
STC825X  
STC6342X  
STC6343X  
STC6344X  
STC6345X  
-
-
-
-
-
-
-
-
1
2
3
4
5
6
7
8
9
-
SOT23-3  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
SOT23-5  
SOT23-6  
-
-
-
-
-
-
-
-
-
-
-
-
10  
11  
12  
-
-
-
-
-
Suffix: X -- Monitored Voltage  
Suffix X  
L
M
T
S
R
Z
Y
Reset threshold (V)  
4.63  
4.38  
3.08  
2.93  
2.63  
2.32  
2.20  
STC  
Ver1.0  
1
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Contents  
Features ....................................................................................................................................................... 1  
Ordering Information .................................................................................................................................. 1  
Introduction ................................................................................................................................................. 1  
Block Diagram ............................................................................................................................................ 3  
Marking Information ................................................................................................................................... 4  
Pin Information ........................................................................................................................................... 5  
Pin Configuration .............................................................................................................................. 5  
Pin Description .................................................................................................................................. 6  
Functional Description ................................................................................................................................ 7  
Reset Output ...................................................................................................................................... 7  
Watchdog Timer ................................................................................................................................ 7  
Manual Reset ..................................................................................................................................... 7  
Power-Fail Comparator ..................................................................................................................... 7  
Recommended Operation Condition ................................................................................................. 8  
Detailed Specifications ................................................................................................................................ 8  
Absolute Maximum Ratings .............................................................................................................. 8  
DC Electrical Characteristics ............................................................................................................. 9  
AC Electrical Characteristics ........................................................................................................... 10  
Mechanical Information ............................................................................................................................ 11  
Notes ......................................................................................................................................................... 14  
STC  
Ver1.0  
2
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Block Diagram  
Figure 1. Block Diagram  
Watchdog  
Transition Detector  
Watchdog Timer  
WDI  
V
cc  
Timebase for Reset  
& Watchdog  
MR  
Vcc  
RESET  
Reset Generator  
(RESET)  
V
RST  
PFI  
PFO  
1.25V  
STC  
Ver1.0  
3
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Marking Information  
Code  
1 2  
3
Description  
Part Number  
Year  
1 2 3  
4
4
Work Week  
Part Number Code  
Code 1 2  
Part No.  
Code 1 2  
BC  
BD  
BE  
Part No.  
STC803L  
STC803M  
STC803T  
STC803S  
STC803R  
STC803Z  
STC803Y  
STC823L  
STC823M  
STC823T  
STC823S  
STC823R  
STC823Z  
STC823Y  
STC824L  
STC824M  
STC824T  
STC824S  
STC824R  
STC824Z  
STC824Y  
STC825L  
STC825M  
STC825T  
STC825S  
STC825R  
STC825Z  
STC825Y  
Code 1 2  
Part No.  
AA  
AB  
AC  
AD  
AE  
AF  
AG  
AH  
AI  
STC809L  
STC809M  
STC809T  
STC809S  
STC809R  
STC809Z  
STC809Y  
STC810L  
STC810M  
STC810T  
STC810S  
STC810R  
STC810Z  
STC810Y  
STC811L  
STC811M  
STC811T  
STC811S  
STC811R  
STC811Z  
STC811Y  
STC812L  
STC812M  
STC812T  
STC812S  
STC812R  
STC812Z  
STC812Y  
CE  
CF  
CG  
CH  
CI  
STC6342L  
STC6342M  
STC6342T  
STC6342S  
STC6342R  
STC6342Z  
STC6342Y  
STC6343L  
STC6343M  
STC6343T  
STC6343S  
STC6343R  
STC6343Z  
STC6343Y  
STC6344L  
STC6344M  
STC6344T  
STC6344S  
STC6344R  
STC6344Z  
STC6344Y  
STC6345L  
STC6345M  
STC6345T  
STC6345S  
STC6345R  
STC6345Z  
STC6345Y  
BF  
BG  
BH  
BI  
CJ  
CK  
CL  
CM  
CN  
CO  
CP  
CQ  
CR  
CS  
CT  
CU  
CV  
CW  
CX  
CY  
CZ  
DA  
DB  
DC  
DD  
DE  
DF  
BJ  
BK  
BL  
AJ  
BM  
BN  
BO  
BP  
AK  
AL  
AM  
AN  
AO  
AP  
AQ  
AR  
AS  
AT  
AU  
AV  
AW  
AX  
AY  
AZ  
BA  
BB  
BQ  
BR  
BS  
BT  
BU  
BV  
BW  
BX  
BY  
BZ  
CA  
CB  
CC  
CD  
STC  
Ver1.0  
4
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Pin Information  
Pin Configuration  
Figure 2. Pin Configuration  
SOT23-3  
S T C 8 0 3  
S T C 8 0 9  
S T C 8 1 0  
1
G N D  
1
G N D  
3
3
V C C  
V C C  
2
R E S E T  
2
R E S E T  
SOT23-5  
S T C 8 1 1  
S T C 8 1 2  
1
2
3
5
4
1
5
4
G N D  
G N D  
N C  
V C C  
V C C  
2
N C  
3
R E S E T  
M R  
R E S E T  
M R  
S T C 8 2 3  
S T C 8 2 4  
S T C 8 2 5  
1
5
4
5
4
1
5
4
R E S E T  
1
R E S E T  
R E S E T  
V C C  
W D I  
V C C  
W D I  
V C C  
2
3
G N D  
M R  
G N D  
2
3
G N D  
2
3
R E S E T  
R E S E T  
M R  
SOT23-6  
S T C 6 3 4 2  
S T C 6 3 4 3  
S T C 6 3 4 4  
S T C 6 3 4 5  
1
V C C  
G N D  
PFI  
R E S E T  
6
1
V C C  
G N D  
PFI  
R E S E T  
6
1
V C C  
G N D  
PFI  
R E S E T  
R E S E T  
P F O  
6
2
3
M R  
5
4
2
3
M R  
5
4
2
3
5
4
P F O  
P F O  
STC  
Ver1.0  
5
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Pin Description  
Table 2. Pin Description  
Pin Name  
MR  
Type  
I
Description  
Manual-Reset: (CMOS). Active low. Pull low to force a reset. Reset remains asserted for the duration  
of the Reset Timeout Period after MR transitions from low to high. Leave unconnected or connected  
to VCC if not used.  
Power Supply: Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset  
remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout  
Vcc  
Power  
Period (tRS) once VCC rises above VRST  
.
GND  
PFI  
Ground  
I
Ground Reference for all signals  
Power-Fail Voltage Monitor Input. When PFI <VPFT , PFO goes low. Connect PFI to GND or Vcc  
when not used.  
Power-Fail Output: it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays  
high.  
PFO  
WDI  
O
I
Watchdog Input (CMOS). If WDI remains high or low for the duration of the watchdog timeout period  
(tWD), the internal watchdog timer trigger a reset output. Floating WDI or connecting WDI to a high-  
impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears  
whenever reset is asserted or WDI occurs a rising or falling edge.  
Active-Low Reset Output (Push-Pull or Open-Drain). It goes low when Vcc is below the reset  
threshold. It remains low for about 200ms after one of the following occurs: Vcc rises above the reset  
threshold (VRST), the watchdog triggers a reset, or MR goes from low to high.  
RESET  
O
RESET  
NC  
O
-
The inverse of RESET, active high. Whenever RESET is high, RESET is low.  
No connection  
STC  
Ver1.0  
6
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Watchdog Timer  
Functional Description  
The STC823/824 watchdog circuit monitors the µPs activity. If  
the µP does not toggle the watch-dog input (WDI) within 1.6s,  
Reset Output  
reset asserts. As long as reset is asserted or the WDI input is  
A microprocessors (µPs) reset input starts the µP in a known  
toggled, the watchdog timer will stay clear and will not count.  
state. Whenever the µP is in an unknown state, it should be  
As soon as reset is released, the timer will start counting. WDI  
held in reset. The supervisory circuits assert reset during power-  
input pulses as short as 50ns can be detected.  
up and prevent code execution errors during power-down or  
Disable the watchdog function by leaving WDI unconnected  
brownout conditions.  
or by three-stating driver connected to WDI.  
On power-up, once Vcc reaches about 1.0V, RESET is a  
guaranteed logic low of 0.4V or less.AsVcc rises, RESET stays  
Manual Reset  
low.WhenVcc rises above the reset threshold, an internal timer  
The manual-reset input (MR) allows reset to be triggered by a  
releases RESET after about 200ms. RESET pulses low whenever  
push button switch. MR has an internal pullup resistor, so it  
Vcc drops below the reset threshold, i.e. brownout condition.  
can be left open when not used.  
If brownout occurs in the middle of a previously initiated reset  
pulse, the pulse continues for at least another 200ms. On power-  
Power-Fail Comparator  
down, once Vcc falls below the reset threshold, RESET stays  
low and is guaranteed to be 0.4V or less until Vcc drops below  
1.0V. Fig 4 shows the timing relationship.  
The power-fail comparator can be used for various purposes  
because its output and noninverting input are not internally  
connected. The inverting input is internally connected to a  
1.25V reference.  
The active-high RESET output is simply the inverse of the  
RESET output, and is guaranteed to be valid with Vcc down to  
1.0V.  
Figure 3. Typical Application Circuit  
DC Linear  
Regulator  
IN  
µP  
Vcc  
RESET  
I/O Line  
Interrupt  
Vcc  
RESET  
P
Supervisory  
µ
Circuit  
PFI  
MR  
WDI  
PFO  
STC  
Ver1.0  
7
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Detailed Specifications  
Absolute Maximum Ratings  
Note:  
Storage Temperature .......................................................-65oC to +150oC  
Stresses greater than those listed under MAXIMUM  
Ambient Temperature with Power Applied ....................... -40oC to +85oC  
RATINGS may cause permanent damage to the  
Supply Voltage to Ground Potential (Vcc to GND) ........... -0.3V to +7.0V  
device. This is a stress rating only and functional  
DC Input Voltage (All inputs except Vcc and GND) ..... -0.3VtoVCC+0.3V operation of the device at these or any other condi-  
tions above those indicated in the operational sec-  
tions of this specification is not implied. Exposure  
to absolute maximum rating conditions for ex-  
tended periods may affect reliability.  
DC Output Current (All outputs) .................................................... 20mA  
Power Dissipation........................................................................ 320mW  
(Depend on package)  
Recommended Operation Condition  
Table 3. DC Electrical Characteristics  
Sym  
Description  
Supply Voltage for  
Test Conditions  
Min  
4.5  
Typ  
5.0  
3.3  
3.0  
2.5  
Max  
5.5  
Unit  
V
xL, xxxM  
Supply Voltage for xxT, xxxS  
Supply Voltage for xxxR  
3.0  
5.5  
V
VCC  
2.7  
5.5  
V
Supply Voltage for  
xZ, xxxY  
2.4  
5.5  
V
VIH  
VIL  
TA  
Input High Voltage  
0.7VCC  
V
Input Low Voltage  
0.3VCC  
85  
V
Operating Temperature  
-40  
OC  
STC  
Ver1.0  
8
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
DC Electrical Characteristics  
Table 4. DC Electrical Characteristics  
(Vcc=VRN+5% to 5.5V, TA= -40~85C, unless otherwise noted)  
Symbol  
Description  
Test Conditions  
Min  
Typ  
Max  
Unit  
VCC  
Operating Voltage Range  
1.0  
5.5  
V
ICC  
VIH  
VIL  
Supply Current  
Vcc = 5V, No load  
20  
50  
µA  
V
Input High Voltage  
Input Low Voltage  
Pin: MR, WDI  
Pin: MR, WDI  
0.7 Vcc  
0.3 Vcc  
V
VRN-2.5%  
4.514  
4.271  
3.003  
2.857  
2.564  
2.262  
2.145  
VRN  
VRN+2.5%  
4.746  
4.490  
3.157  
3.003  
2.696  
2.378  
2.255  
STCxxxL  
STCxxxM  
STCxxxT  
4.63  
4.38  
3.08  
2.93  
2.63  
2.32  
2.20  
Reset Threshold Voltage  
(Note 1)  
VRST  
V
TA= -40 ~ 85C STCxxxS  
STCxxxR  
STCxxxZ  
STCxxxY  
Reset Threshold  
Hysteresis(Note 1)  
VRTH  
70  
mV  
V
Vcc varies between VRN±5%  
Vcc-1.5  
0.8 Vcc  
0.8 Vcc  
Vcc 4.5V Isource=800µA  
Vcc 2.7V Isource=500µA  
Vcc 1.8V Isource=150µA  
Vcc 4.5V Isink=3.2mA  
Vcc 2.7V Isink=1.2mA  
Vcc 1.2V Isink=100µA  
VOH  
Output High Voltage  
Output Low Voltage  
0.4  
0.3  
0.3  
VOL  
V
Open-Drain Output  
Leakage Current  
VCC > VTH(MAX)  
for STC803 and STC6343  
ILKG  
VPFT  
IPFI  
1
µA  
V
PFI Input Threshold  
VPFI varies from 1.5V and 1.0V  
1.20  
1.25  
1.30  
±25  
160  
PFI Input Leakage  
Current  
nA  
WDI connected to VCC: 5.5V  
WDI connected to GND  
STC811/7812  
120  
-15  
20  
Average WDI Input  
Current (Note 2)  
IWDI  
µA  
kΩ  
-20  
10  
35  
60  
30  
75  
MR pull-up resistor  
(internal)  
STC823/824/825  
52  
r
STC6342/6343/6344  
* Valid for both RESET and RESET. VRN is nominal reset threshold voltage.  
** WDI is internally serviced within the watchdog period if WDI is left unconnected.  
STC  
Ver1.0  
9
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
AC Electrical Characteristics  
Table 5. AC Electrical Characteristics  
Sym  
tRS  
Description  
Test Conditions  
Min  
140  
Typ  
200  
Max  
280  
Units  
ms  
Reset Pulse Width  
MR from low to High  
WDI and MR tied to VCC,  
VCC > VRN + 5%  
tWD  
Watchdog Timeout Period  
1.12  
1
1.6  
2.25  
s
tMR  
tMD  
tWP  
MR Pulse Width  
MR to RESET Delay  
WDI Pulse Width  
µs  
ns  
ns  
VCC = 5.0V  
250  
50  
Figure 4. Watchdog Timing Diagram  
V RST  
V RST  
V C C  
tRS  
tRS  
tW D  
tRS  
R E SE T  
R E SE T  
tW P  
tM D  
W D I  
M R  
tM R  
STC  
Ver1.0  
10  
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Mechanical Information  
Figure 5. SOT23-3  
0.075  
1.90  
BSC  
0.059 1.50  
0.068 1.75  
0.102 2.60  
0.118 3.00  
0o - 10o  
Datum A”  
0.004 0.10  
0.023 0.60  
0037  
0.95  
BSC  
0.014 0.35  
0.019 0.50  
0.110 2.80  
0.118 3.00  
0.057 1.45 MAX  
SEATING  
PLANE  
0.000 0.00  
0.005 0.15  
X.XX Denotes Dimensions  
X.XX In Millimeters  
Notes:  
1)Controlling dimensions in millimeters  
2)Ref: EIAJ SC-74A  
3)Foot length is measured at flat portion of foot, reference to Datum A  
STC  
Ver1.0  
11  
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Figure 6. SOT23-5  
0.075  
1.90  
BSC  
0.059 1.50  
0.068 1.75  
0.102 2.60  
0.118 3.00  
0o - 10o  
Datum A”  
0.004 0.10  
0.023 0.60  
0037  
0.95  
BSC  
0.014 0.35  
0.019 0.50  
0.110 2.80  
0.118 3.00  
0.057 1.45 MAX  
SEATING  
PLANE  
0.000 0.00  
0.005 0.15  
X.XX Denotes Dimensions  
X.XX In Millimeters  
Notes:  
1)Controlling dimensions in millimeters  
2)Ref: EIAJ SC-74A  
3)Foot length is measured at flat portion of foot, reference to Datum A  
STC  
Ver1.0  
12  
Data Sheet  
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345  
µP Supervisor Circuits  
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------  
Figure 7. SOT23-6  
0.075  
1.90  
BSC  
0.059 1.50  
0.068 1.75  
0.102 2.60  
0.118 3.00  
0o - 10o  
Datum A”  
0.004 0.10  
0.023 0.60  
0037  
0.95  
BSC  
0.014 0.35  
0.019 0.50  
0.110 2.80  
0.118 3.00  
0.057 1.45 MAX  
SEATING  
PLANE  
0.000 0.00  
0.005 0.15  
X.XX Denotes Dimensions  
X.XX In Millimeters  
Notes:  
1)Controlling dimensions in millimeters  
2)Ref: EIAJ SC-74A  
3)Foot length is measured at flat portion of foot, reference to Datum A  
STC  
Ver1.0  
13  

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