Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsPMICsPMIC - system monitor Dual voltage detector TSSOP 8

January 2008 Rev 3 1/19

STM6905

Quintuple, ultralow voltage supervisor

with push-button reset

Features

■ Quintuple voltage monitoring

■ Accurate ±1.8% across temperature voltage

threshold (±1% at 25°C)

■ Primary supply (V

) monitor. Fixed (factory -

programmed) reset thresholds: 3.078 V to

2.866 V

■ Second fixed (V2IN) monitor. Fixed (factory-

programmed) reset thresholds: 2.333 V to

1.050 V

■ Three additional adjustable supply monitor

inputs (externally adjustable)

■ 600 mV internal reference

■ RST output (open drain)

■ Output guaranteed for V

≥ 0.8 V

■ Reset delay time (t

rec

) on power-up: 210 ms

(typ)

■ Manual reset input (MR)

■ Low supply current of 12 µA (typ)

■ Power supply voltage 0.8 V to 5.5 V

■ RoHS compliant (green package)

■ 8-pin MSOP/TSSOP

■ Operating temperature: –40°C to 85°C

(industrial grade)

Applications

■ Set-top boxes

■ Multi-voltage systems

■ Cable/satellite applications

■ Computer systems

■ Data storage equipment

MSOP8

(TSSOP8) (DS)

Table 1. Device summary

(1)

Order code V

RST1

(V) V

RST2

(V) t

REC

(ms) Package

STM6905TZEDS6F 3.078 2.333 210 MSOP8(TSSOP8)

STM6905TWEDS6F 3.078 1.683 210 MSOP8(TSSOP8)

STM6905TGEDS6F 3.078 1.110 210 MSOP8(TSSOP8)

STM6905SYEDS6F 2.955 2.188 210 MSOP8(TSSOP8)

STM6905SFEDS6F 2.955 1.050 210 MSOP8(TSSOP8)

STM6905PWEDS6F 2.866 1.683 210 MSOP8(TSSOP8)

1. Other reset threshold voltages and t

REC

time-out periods are offered. Minimum order quantities may apply. Contact local

ST sales office for availability.

www.st.com

Summary of content (19 pages)

PAGE 1
STM6905 Quintuple, ultralow voltage supervisor with push-button reset Features ■ Quintuple voltage monitoring ■ Accurate ±1.8% across temperature voltage threshold (±1% at 25°C) ■ Primary supply (VCC) monitor. Fixed (factory programmed) reset thresholds: 3.078 V to 2.866 V ■ Second fixed (V2IN) monitor. Fixed (factoryprogrammed) reset thresholds: 2.333 V to 1.
PAGE 2
Contents STM6905 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 2.1 Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 VCC primary supply voltage monitoring input . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 V2IN second fixed voltage monitoring input .
PAGE 3
STM6905 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal names and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
List of figures STM6905 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. 4/19 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MSOP/TSSOP-8 connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
STM6905 1 Description 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 (VCC and V2IN) have fixed (customer-selectable, factory-trimmed) thresholds (VRST1 and VRST2).
PAGE 6
Description STM6905 Table 2.
PAGE 7
STM6905 Pin descriptions 2 Pin descriptions 2.1 Push-button reset input (MR) When MR goes low the RST output is driven low, RST remains low as long as MR is low and for tREC after MR returns to high. The active-low input has an internal 10k ohm pull-up resistor to VCC. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs, or connected to VSS through a switch. If unused, leave this pin open or connect it to VCC.
PAGE 8
Pin descriptions Figure 3. STM6905 Functional block diagram VCC VRST1 COMPARE VRST2 COMPARE V2IN V3IN VREF = 0.6V COMPARE VREF = 0.6V COMPARE VREF = 0.6V COMPARE trec Generator RST V4IN V5IN VCC (1) MR ai13970 1. Internal pull-up on MR input of 10k ohm (typ). Figure 4. Typical hardware hookup application diagram From DC/DC Converter VCC2 V TRIP = (600mV) VTRIP = (600mV) V TRIP = (600mV) ( R1R2+ R2 ) ( R3R4+ R4 ) ( R5R6+ R6 ) VCC1 VCC 0.1 F STM6905 VIN2 VCC3 0.
PAGE 9
STM6905 3 Operation Operation The STM6905 provides the ability to monitor critical voltages such as power-supply and battery voltage levels, while interfacing easily to the system controllers/microprocessors. Figure 4 shows typical hardware hookup for monitoring five voltages; two fixed thresholds (customer-selectable, factory-programmed ) and three adjustable monitor inputs. RST output is open drain and requires a 10k ohms pull-up resistor tied to VCC. 3.
PAGE 10
Voltage monitoring STM6905 4 Voltage monitoring Figure 5. MR timing waveforms tMLMH MR tMLMR RST tREC ai13974 Figure 6.
PAGE 11
STM6905 5 Maximum rating Maximum rating Stressing the device above the rating listed in the "Absolute maximum ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PAGE 12
DC and AC parameters 6 STM6905 DC and AC parameters This section summarizes the operating measurement conditions and the DC and AC characteristics of the device. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. Table 4. Sym DC and AC characteristics Alternative Description VCC Operating voltage ICC VCC supply current I2IN V2IN supply curent Test condition(1) Min Typ 0.8 Max Unit 5.5 V VCC < 5.
PAGE 13
STM6905 Table 4. Sym DC and AC parameters DC and AC characteristics (continued) Alternative Description Reset threshold hysteresis VHYST VCC to RST delay tRD Test condition(1) tRP Typ Max Unit Referenced to VRST1/VRST2 typical 0.
PAGE 14
Package mechanical data 7 STM6905 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark.
PAGE 15
STM6905 Package mechanical data Table 5. TSSOP 8-lead package mechanical data mm inches Symbol Min Typ A Min Typ 1.100 A1 0.00 A2 0.75 b c Max 0.043 0.15 0.000 0.95 0.030 0.22 0.40 0.009 0.016 0.08 0.23 0.003 0.009 0.85 ccc D Max 0.006 0.034 0.10 2.80 e 3.00 3.20 0.037 0.004 0.110 0.65 0.118 0.126 0.026 E 4.65 4.90 5.15 0.183 0.193 0.203 E1 2.80 3.00 3.10 0.110 0.118 0.122 L 0.40 0.60 0.80 0.016 0.024 0.032 L1 0.95 0.037 L2 0.25 0.
PAGE 16
Part numbering 8 STM6905 Part numbering Table 6. Ordering information scheme Example: STM6905 TZ E DS 6 Device type STM6905 Reset threshold voltages(1) Suffix VRST1 VRST2 TZ 3.078 2.333 TW 3.078 1.683 TG 3.078 1.110 SY 2.955 1.050 SF 2.955 1.050 PW 2.866 1.683 tREC B = 30 ms(1) C = 120 ms(1) E = 210 ms F = 420 ms(1) Package DS = MSOP8 (TSSOP8) Temperature range 6: -40°C to 85°C Shipping method E = ECOPACK® package, tubes F = ECOPACK® package, tape & reel 1.
PAGE 17
STM6905 Package marking information 9 Package marking information Table 7. Marking description Part marking VRST1 (V) VRST2 (V) Package Topside marking STM6905TZEDS6F 3.078 2.333 MSOP (TSSOP8) STZE STM6905TWEDS6F 3.078 1.683 MSOP (TSSOP8) STWE STM6905TGEDS6F 3.078 1.110 MSOP (TSSOP8) STGE STM6905SYEDS6F 2.955 2.188 MSOP (TSSOP8) SSYE STM6905SFEDS6F 2.955 1.050 MSOP (TSSOP8) SSFE STM6905PWEDS6F 2.866 1.
PAGE 18
Revision history 10 STM6905 Revision history Table 8. 18/19 Document revision history Date Revision Changes 19-Dec-2007 1 Initial release. 23-Jan-2008 2 Document status upgraded to full datasheet. 28-Jan-2008 3 Updated cover page, Figure 6, and Table 4.
PAGE 19
STM6905 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.