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STM6904PWEDS6F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
List of figures STM6904
4/20 Doc ID 14289 Rev 3
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 x 3mm, package mechanical outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
STM6904 Description
Doc ID 14289 Rev 3 5/20
1 Description
The STM6904 supervisor is a low voltage/low supply current processor supervisor,
designed to monitor up to four 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 four supply
monitors (V
CC
and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds
(V
RST1
and V
RST2
). The other two voltage monitor inputs (V3IN and V4IN) are monitored
using externally adjustable threshold (0.600 V internal reference) to meet specific level
requirements.
If any of the four 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. This
device is in the correct reset output logic state when V
CC
greater than 0.8 V.
The STM6904 is available in a standard 8-lead MSOP (TSSOP) package.
Figure 1. Logic diagram
Figure 2. MSOP/TSSOP-8 connections
V4IN
V
CC
STM6904
MR
RST
V
SS
TR
SEL
V2IN
V3IN
ai13976
1
V3IN
V
SS
V4IN
TR
SEL
V
CC
MR
RST
V2IN
ai13977
2
3
4
8
7
6
5
Description STM6904
6/20 Doc ID 14289 Rev 3
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
5 V3IN Input Adjustable third reset comparator input
6 V4IN Input Adjustable fourth reset comparator input
7TR
SEL
Input
Controls selectable t
REC
. Two t
REC
options available.
If pin is tied high (V
CC
), t
REC
= 420 ms
If pin is tied low (V
SS
), t
REC
= 210 ms
Note: Pin must be tied to V
CC
or V
SS
(do not float)
8RST
Output Active-low open drain reset output (10 kΩ internal pull-up)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

STM6904PWEDS6F

Mfr. #:
Buy STM6904PWEDS6F
Manufacturer:
STMicroelectronics
Description:
Supervisory Circuits Quad Quint Ultra-Low Current Multi Volt
Lifecycle:
New from this manufacturer.
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