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STM6905PWEDS6F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
List of figures STM6905
4/19 DocID14290 Rev 4
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. MSOP/TSSOP-8 connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Typical hardware hookup application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. MR
timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Voltage monitoring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. TSSOP8 3 mm x 3 mm, package mechanical outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DocID14290 Rev 4 5/19
STM6905 Description
18
1 Description
The STM6905 supervisor is a low voltage/low supply current processor supervisor,
designed to monitor up to five system power supply voltages. This device is targeted at
applications such as set-top boxes (STBs), portable, battery-powered systems, networking
and communication systems.
The device supports a push-button type manual reset input (MR). Two of the five supply
monitors (V
CC
and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds
(V
RST1
and V
RST2
). The other three voltage monitor inputs (V3IN, V4IN and V5IN) are
monitored using externally adjustable threshold (600 mV internal reference) to meet specific
level requirements.
If any of the five monitored voltages drops below its factory-trimmed or adjustable
thresholds, or if the
MR is asserted to logic low, the reset output RST is asserted (driven
low). Once asserted,
RST is maintained low for a minimum delay period (t
REC
) after ALL
monitored supplies rise above their respective thresholds and
MR returns to high. The reset
output logic state is valid for V
CC
greater than 0.8 V.
The STM6905 is available in a standard 8-lead MSOP (TSSOP) package.
Figure 1. Logic diagram
Figure 2. MSOP/TSSOP-8 connections
V4IN
V
CC
STM6905
MR
RST
V
SS
V5IN
V2IN
V3IN
ai13970
1
V3IN
V
SS
V4IN
V5IN
V
CC
MR
RST
V2IN
ai13971
2
3
4
8
7
6
5
Description STM6905
6/19 DocID14290 Rev 4
Table 2. Signal names and functions
Pin Name Type Function
1MR
Input Active-low manual reset input with internal pull-up resistor
2V
CC
Supply
Primary supply voltage input and integrated fixed threshold under-
voltage monitor
3 V2IN Input Second fixed threshold input monitor
4V
SS
Supply Ground
5V3IN
Input
Adjustable third reset comparator input
6 V4IN Adjustable fourth reset comparator input
7 V5IN Adjustable fifth reset comparator input
8RST
Output Active-low open-drain reset output (10 kΩ internal pull-up)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

STM6905PWEDS6F

Mfr. #:
Buy STM6905PWEDS6F
Manufacturer:
STMicroelectronics
Description:
Supervisory Circuits Low V/ Low Supply Supervisor
Lifecycle:
New from this manufacturer.
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