JBL ES250PW Service Manual page 39

Es series. wireless powered subwoofer
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ES250PW
STM809/810/811/812
SUMMARY DESCRIPTION
The STM809/810/811/812 MICROPROCESSOR
RESET Circuits are low-power supervisory devic-
es used to monitor power supplies. They perform
a single function: asserting a reset signal whenev-
er the V
Figure 2. Logic Diagram (STM809/810)
Note: 1. For STM810
Figure 3. Logic Diagram (STM811/812)
MR
Note: 1. For STM812
Figure 6. Block Diagram
Note: 1. STM811/812 only
2. RST for STM810/812
4/18
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supply voltage drops below a preset
CC
V
CC
STM809/810
V
SS
V
CC
STM811/812
RST (RST)
V
SS
V
CC
V
(1)
MR
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value and keeping it asserted until V
above the preset threshold for a minimum period
of time (t
push-button reset input (MR).
Table 2. Signal Names
V
SS
RST
(1)
RST
V
(1)
CC
RST (RST)
(2)
MR
Note: 1. STM810/812 only
2. STM811/812 only
Figure 4. SOT23-3 Connections
AI07832
RST (RST)
Figure 5. SOT143-4 Connections
(1)
RST (RST)
AI07831
COMPARE
RST
DEBOUNCE
38
CC
). The STM811/812 also provide a
rec
Ground
Active-Low RESET Output
Active-High RESET Output
Supply Voltage
Manual Reset Input
V
1
SS
V
3
CC
2
(For STM810)
AI07833
V
1
4
V
SS
CC
2
3
MR
(For STM812)
AI07834
t
(2)
rec
RST
Generator
AI07835
has risen

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