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PDF MIC2785 Data sheet ( Hoja de datos )
| Número de pieza | MIC2785 | |
| Descripción | Dual Supply Voltage Monitor | |
| Fabricantes | MICREL | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2785 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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MIC2785
Dual Supply Voltage Monitor
with Manual Reset
General Description
Features
The MIC2785 is a micropower voltage monitor that
provides under-voltage monitoring and manual reset
capability in a tiny 1.2mm x 1.2mm MLF® package. The
MIC2785 provides a monitored voltage input (VIN) separate
from the supply input (VDD). This insures that the reset
(/RST) output maintains a valid output state when the
voltage being monitored ramps up or down. The device
also includes a manual reset input (/MR). The /RST output
is an active low push-pull output.
The under-voltage detector compares the VIN pin voltage
against the factory-programmed threshold of 1.62V. The
reset output is asserted any time the input voltage drops
below the programmed threshold voltage. A reset can be
generated at any time by asserting the manual reset input,
/MR. This reset output will remain active until the release
of /MR. The /MR input can also be used to daisy-chain the
MIC2785 onto existing power monitoring circuitry or other
supervisors. Hysteresis is included to prevent chattering
due to noise.
• No external components
• Monitors input voltage for under-voltage condition
• Separate inputs for supply (VDD) and monitor (VIN)
• +1.5% VIN threshold voltage accuracy
• Valid /RST state with VIN down to 0.0V
• Valid /RST state with VDD down to 1.20V
• Factory-programmed 1.62V reference
• Manual reset input (/MR)
• Active low RESET (/RST) output
• Ultra-low input current – 5µA total (VIN and VDD)
• Rejects brief input transients
• -25°C to 85°C operating temperature range
• RoHS lead-free compliant
• Available in tiny 6-pin 1.2mm x 1.2mm Thin MLF®
package
The MIC2785 consumes a minimum of quiescent current,
only 5µA, 1.5µA from the main supply pin and 3.5µA from
the input pin. Offered in a tiny, space saving 6-pin MLF®
(1.2mm x 1.2mm), package. (RoHS lead-free compliant).
Applications
• Mobile phones
• PDAs
Datasheets and support documentation can be found on • GPS receivers
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
www.DataSheet4U.com
Memory or Microprocessor Voltage Monitor
MicroLeadFrame and MLF are registered trademark of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2009
M9999-031709-A
1 page  
Micrel, Inc.
Functional Diagram
MIC2785
Application Information
Design and Product Advantages
The MIC2785’s tiny 1.2mm x 1.2mm Thin MLF® package
combined with no external components offers several
advantages compared to conventional voltage
supervisors.
Tremendous savings are captured with decreased board
size, reduced circuit complexity, and decreased bill of
material (BOM) cost.
Power Supply Input (VDD)
The VDD pin provides a stable input power for the
internal circuitry. This insures that the reference circuitry
and monitoring circuitry have a stable voltage over the
entire operating voltage range.
Supply bypassing is not required. However, bypassing
may be valuable depending on the quality of the system
voltage to which the VDD pin is connected. If bypassing
is added, connect the capacitor(s) as closely as possible
to the VDD pin. Place the lowest value capacitors
closest to the VDD pin.
Under-Voltage Detector Input (VIN)
The largest portion of the monitoring circuitry is the VIN
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pin
the
is connected to the non-
comparator. The internal
reference is connected to the inverting terminal of the
comparator. A reset is triggered when VIN falls below
VREF. The VIN pin circuitry includes hysteresis to prevent
/RST pin chattering due to noise. The VIN pin is
relatively immune to very brief negative-going transients.
Reset Output (/RST)
The /RST pin is a complementary push-pull output,
which source and sink current. The reset output is
asserted any time the VIN pin voltage is less than the
threshold voltage (VIN < VTH) or the /MR pin is asserted.
The /RST pin responds very quickly to reset conditions,
typically asserting within 5µs of VIN < VTH.
The MIC2785 securely monitors the supply voltage of
critical components like microcontrollers and
microprocessors. With the MIC2785’s /RST pin
connected to the μP’s reset pin, the processor will be
properly reset at power on and during power-down and
brown-out conditions.
Manual Reset Input (/MR)
The /MR pin provides the ability to initiate a reset via
external logic or a manual switch. This is in addition to
the MIC2785’s automatic voltage monitoring function.
Asserting the /MR input to a logic low causes an
immediate and unconditional reset. Assuming the VIN
pin voltage is within tolerance when /MR is released
(returns high), the reset output will be de-asserted. /MR
is internally pulled-up to VDD and may be left floating/
open if unused.
March 2009
5 M9999-031709-A
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MIC2785.PDF ] | |
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