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PDF SP693A Data sheet ( Hoja de datos )
| Número de pieza | SP693A | |
| Descripción | Low Power Microprocessor Supervisory with Battery Switch-Over | |
| Fabricantes | Sipex | |
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® SP691A/693A/800L/800M
Low Power Microprocessor Supervisory
with Battery Switch-Over
FEATURES
■ Precision 4.65V/4.40V Voltage Monitoring
■ 200ms Or Adjustable Reset Time
■ 100ms, 1.6s Or Adjustable Watchdog Time
■ 60µA Maximum Operating Supply Current
■ 2.0µA Maximum Battery Backup Current
■ 0.1µA Maximum Battery Standby Current
■ Power Switching
250mA Output in Vcc Mode (0.6Ω)
25mA Output in Battery Mode (5Ω)
■ On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
6ns CE Gate Propagation Delay
■ Voltage Monitor for Power-Fail or Low Battery
■ Backup-Battery Monitor
■ RESET Valid to Vcc=1V
■ 1% Accuracy Guaranteed (SP800L/800M)
■ Pin Compatible Upgrade to MAX691A/693A/
800L/800M
TOP VIEW
VBATT 1
VOUT 2
Vcc 3
GND 4
BATT ON 5
LOWLINE 6
OSCIN 7
OSCSEL 8
Corporation
16 RESET
15 RESET
14 WDO
13 CEIN
12 CEOUT
11 WDI
10 PFO
9 PFI
DIP/SO
Now Available in Lead Free Packaging
DESCRIPTION
The SP691A/693A/800L/800M is a microprocessor (µP) supervisory circuit that integrates
a myriad of components involved in discrete solutions to monitor power-supply and
battery-control functions in µP and digital systems. The SP691A/693A/800L/800M offers
complete µP monitoring and watchdog functions. The SP691A/693A/800L/800M is ideal for
a low-cost battery management solution and is well suited for portable, battery-powered
applications with its supply current of 35µA. The 6ns chip-enable propagation delay,
the 25mA current output in battery-backup mode, and the 250mA current output in
standard operation also makes the SP691A/693A/800L/800M suitable for larger scale,
high-performance equipment.
Part Number
SP691A
SP693A
SP800L
SP800M
RESET Threshold RESET Accuracy
4.65V
+125mV
4.40V
+125mV
4.65V
+50mV
4.40V
+50mV
PFI Accuracy
+4%
+4%
+1%
+1%
Backup-Battery Switch
YES
YES
YES
YES
Date: 4/18/05
SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over © Copyright 2005 Sipex Corporation
1
1 page  
ELECTRICAL CHARACTERISTICS
V = +4.75V to +5.5V for the SP691A/800L, V = +4.5V to +5.5V for the SP693A/800M, V = +2.8V, and T = T to T unless otherwise
CC
CC
BATT
AMB
MIN
MAX
noted. Typical values apply at T =+25OC.
AMB
NOTE 1: Either VCC or VBATT can go to 0V, if the other is greater than 2.0V.
NOTE 2: The supply current drawn by the SP691A/693A/800L/800M from the battery (excluding IOUT) typically
goes to 5µA when (VBATT - 1V) < VCC < VBATT. In most applications, this is a brief period as VCC falls through this region.
NOTE 3: "+" = battery-discharging current, "-" = battery-charging current.
NOTE 4: Although presented as typical values, the number of clock cycles for the reset and watchdog timeout
periods are fixed and do not vary with process or temperature.
NOTE 5: RESET is an open-drain output and sinks current only.
NOTE 6: WDI is internally connected to a voltage divider between VOUT and GND. If unconnected, WDI is driven
to 1.6V (typ), disabling the watchdog function.
NOTE 7: The chip-enable resistance is tested with VCC = +4.75V for the SP691A/800L and VCC = +4.5V for the
SP693A/800M. CE = CE = V /2.
IN
OUT
CC
NOTE 8: The chip-enable propagation delay is measured from the 50% point at CEIN to the 50% point at CEOUT.
(TAMB = 25oC, unless otherwise noted)
TYPICAL PERFORMANCE CHARACTERISTICS
43 VCC = 5V
VBATT = 2.8V
40
37
34
31
28
25
-60 -30
0 30 60 90
Temperature (oC)
120
Figure 1. VCC Supply Current vs. Temperature (Normal
Operating Mode)
2.5
2.0
VCC = 1.6V
VBATT = 2.8V
1.5
1.0
0.5
0.0
-0.5
-60 -30
0 30 60 90 120 150
Temperature (oC)
Figure 2. Battery Supply Current vs. Temperature
(Battery-Backup Mode)
75.0
70.0
65.0
60.0
VCC = 4.75V
VBATT = 2.8V
CE IN = VCC/2
55.0
50.0
45.0
40.0
-80 -60 -40 -20 0 20 40 60 80 100 120 140
Temperature (oC)
Figure 3. Chip-Enable On-Resistance vs. Temperature
14
12 VCC = 0V
10
8
6
4
2
0
-60 -30
VBATT = 2V
VBATT = 2.8V
VBATT = 4.5V
0 30 60 90 120 150
Temperature (oC)
Figure 4. VBATT to VOUT On-Resistance vs. Temperature
Date: 4/18/05
SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over © Copyright 2005 Sipex Corporation
5
5 Page 
4) Watchdog function ➡ Monitors µP activity
where the watchdog output goes to a logic
LOW state if the watchdog input is not
toggled for greater than the timeout period.
5) Internal switch ➡ Switches over from VCC
to VBATT if the VCC falls below the reset
threshold.
15
RESET
Corporation
TO µP RESET
10kΩ
RESET and RESET Outputs
The SP691A/693A/800L/800M devices'
RESET and RESET outputs ensure that the µP
powers up in a known state, and prevents
code-execution errors during power-down or
brownout conditions.
The RESET output is active low, and typically
sinks 3.2mA at 0.1V saturation voltage in its
active state. When deasserted, RESET sources
1.6mA at typically VOUT – 0.5V. RESET output
is open drain, active high, and typically sinks
3.2mA with a saturation voltage of 0.1V. When
no backup battery is used, RESET output is
guaranteed to be valid down to VCC = 1V, and
an external 10kΩ pull-down resistor on RESET
ensures that RESET will be valid with VCC
down to GND as shown on Figure 18. As VCC
goes below 1V, the gate drive to the RESET
output switch reduces accordingly, increasing
the RDS(ON) and the saturation voltage. The
10kΩ pull-down resistor ensures the parallel
combination of switch plus resistor is around
Figure 18. External Pull-down Resistor Ensures
RESET is Valid with VCC Down to Ground.
10kΩ and the output saturation voltage is below
0.4V while sinking 40µA. When using a 10kΩ
external pull-down resistor, the high state for
the RESET output with Vcc = 4.75V is 4.5V
typical. For battery voltages less than or equal
to 2V connected to VBATT, RESET and RESET
remains valid for VCC from 0V to 5.5V.
RESET and RESET are asserted when V falls
CC
below the reset threshold and remain asserted
for the Reset Timeout Period (200ms nominal)
after VCC rises above the reset threshold voltage
on power-up. Refer to Figure 19. The devices'
battery-switchover comparator does not affect
reset assertion. However, both reset outputs are
asserted in battery-backup mode since VCC must
be below the reset threshold to enter this mode.
Vcc
RESET
THRESHOLD
CE IN
CE OUT
RESET
RESET
12µ
100µs
100µs
Figure 19. Reset and Chip-Enable Timing
Date: 4/18/05
SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over © Copyright 2005 Sipex Corporation
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SP693A.PDF ] | |
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