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SMM150NR05 Datasheet(PDF) 11 Page - Summit Microelectronics, Inc.

No. de pieza SMM150NR05
Descripción Electrónicos  Single-Channel Supply Voltage Marginer/Monitor
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Fabricante Electrónico  SUMMIT [Summit Microelectronics, Inc.]
Página de inicio  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMM150NR05 Datasheet(HTML) 11 Page - Summit Microelectronics, Inc.

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SMM150
Preliminary Information
Summit Microelectronics, Inc
2075 2.6 05/13/05
11
Fault Latched by a Fault Condition:
The
“Fault
Latched
by
a
Fault
Condition”
programmable option is triggered only on the leading
edge of a Fault. That is, a latched fault can be cleared
while the Fault yet exists.
Fault Latched by Ready I/O Pin:
Fault Latched by Ready I/O pin functions on the
margin transitions from Off to Hi/Low/Nominal or from
Nominal to Hi/Low or Hi/Low to Nominal but not from
Hi/Low/Nominal to Off.
WRITE PROTECTION
Write protection for the SMM150 is located in a volatile
register where the power-on state is defaulted to write
protect. There are separate write protect modes for the
configuration registers and memory. In order to
remove write protection, the code 55HEX is written to
the write protection register.
Other codes will enable write protection. For example,
writing 59HEX will allow writes to the configuration
register but not to the memory, while writing 35HEX will
allow writes to the memory but not to the configuration
registers. The SMM150 also features a Write Protect
pin (WP input) which, when asserted, prevents writing
to the configuration registers and EE memory.
In
addition to these two forms of write protection there is
a
configuration
register
lock
bit
which,
once
programmed, does not allow the configuration
registers to be changed.
A2, A1, A0
The address bits A[2:0] can be hard wired High or Low
or may be left open (High-Z) to allow for a total of 21
distinct device addresses. When floating, the inputs
can tolerate the amount of leakage as described by
the specification IAIT. An external 100k pull-up or pull
down resistor is sufficient to set a High or Low logic
level.
U2
DC-DC Converter
1
2
3
4
7
8
9
10
11
+Vout
+Vout
Sense
+Vout
+Vin
+Vin
+Vin
Trim
Enable
C10
0.1uF
READY
C7
0.01uF
R8
Vdd
R6
FAULT#
J2
Programming Supply
1
2
1
2
VOUT = 1.5V
U3
SMM150
1
2
4
6
7
8
10
12
14
19
20
24
25
28
SCL
A2
A1
A0
GND
WP
CAP_M
COMP2
VM
COMP1
TRIM
MUP
MDN
SDA
C4
0.02uF
C3
10uF
C6
0.01uF
D1
DIODE
MDN
J1
I2C SMX3200 Connector
1
2
3
4
5
6
7
8
9
10
Gnd
SCL
Gnd3
SDA
Rsrv5
MR
+10V
Rsrv8
+5V
Rsrv10
C8
0.1uF
Vdd
R7
C1
0.01uF
R3
20
C2
0.1uF
MUP
C5
1uF
R4 2.5k
C9
0.01uF
R5
+VIN - 2.7V to 5.5V
Figure 6 – Typical applications schematic which shows the SMM150 controlling a 3.3V in/1.5V out DC/DC
converter. Care should be taken to filter DC/DC converter noise from the SMM150 VDD supply pin. This is
accomplished with optional components R3, C1, C2, C3 and C10. This example, using a 1.25V VREF, also
shows the COMP1/2 pins monitoring the DC/DC converter VOUT set to an OV of 1.7V on COMP1 and a UV of
1.3V on COMP2, the voltage divider resistors are:
For OV, R5 = 1.37k, 1% R6 = 3.83k, 1%, For UV, R7= 1.02k, 1% R8 = 25.5k, 1%.
The jumper J2 can be used to supply the SMM150 VDD voltage from the SMX3200 programmer when the
device is programmed with board power off and the controlled supply unloaded.
APPLICATIONS INFORMATION (CONTINUED)


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