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PDF CAT15004 Data sheet ( Hoja de datos )

Número de pieza CAT15004
Descripción (CAT15002 / CAT15004) Voltage Supervisor
Fabricantes Catalyst Semiconductor 
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CAT15002, CAT15004
Voltage Supervisor with 2-Kb and 4-Kb SPI
Serial CMOS EEPROM
FEATURES
„ Precision Power Supply Voltage Monitor
ƒ 5V, 3.3V, 3V & 2.5V systems
ƒ 7 threshold voltage options
„ Active High or Low Reset
ƒ Valid reset guaranteed at VCC = 1V
„ 10MHz SPI compatible
„ 16-byte page write buffer
„ Low power CMOS technology
„ 1,000,000 Program/Erase cycles
„ 100 year data retention
„ Industrial temperature range
„ RoHS-compliant 8-pin SOIC package
For Ordering Information details, see page 14.
PIN CONFIGURATION
SOIC (W)
C¯¯S 1
SO 2
¯W¯P¯ 3
8 VCC
7 RST/¯R¯S¯T¯
6 SCK
VSS 4
5 SI
DESCRIPTION
The CAT15002/04 (see table below) are memory and
supervisory solutions for microcontroller based
systems. A CMOS serial EEPROM memory and a
system power supervisor with brown-out protection
are integrated together. Memory interface is via SPI
bus serial interface.
The CAT15002/04 provides a precision VCC sense
circuit with two reset output options: CMOS active low
output or CMOS active high. The RESET output is
active whenever VCC is below the reset threshold or
falls below the reset threshold voltage.
The power supply monitor and reset circuit protect
system controllers during power up/down and against
brownout conditions. Seven reset threshold voltages
support 5V, 3.3V, 3V and 2.5V systems. If power
supply voltages are out of tolerance reset signals
become active, preventing the system microcontroller,
ASIC or peripherals from operating. Reset signals
become inactive typically 240ms after the supply
voltage exceeds the reset threshold level.
MEMORY SIZE SELECTOR
Product
15002
15004
Memory density
2-Kbit
4-Kbit
PIN FUNCTION
Pin Name
C¯¯S
SO
¯W¯P¯
VSS
SI
SCK
RST/¯R¯S¯T¯
VCC
Function
Chip Select
Serial Data Output
Write Protect
Ground
Serial Data Input
Serial Clock Input
Reset Output
Power Supply
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
Threshold Suffix
Designation
L
M
J
T
S
R
Z
1 Doc. No. 1126 Rev. A

1 page




CAT15004 pdf
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CAT15002, CAT15004
PIN DESCRIPTION
RESET/R¯¯E¯S¯E¯T¯: Reset output is available in two
versions: CMOS Active Low (CAT150xx9) and CMOS
Active High (CAT150xx1). Both versions are push-pull
outputs for high efficiency.
SI: The serial data input pin accepts op-codes,
addresses and data. In SPI modes (0,0) and (1,1)
input data is latched on the rising edge of the SCK
clock input.
SO: The serial data output pin is used to transfer data
out of the device. In SPI modes (0,0) and (1,1) data is
shifted out on the falling edge of the SCK clock.
SCK: The serial clock input pin accepts the clock
provided by the host and used for synchronizing
communication between host and CAT15002/04.
C¯¯S: The chip select input pin is used to enable/disable
the CAT15002/04. When C¯¯S is high, the SO output is
tri-stated (high impedance) and the device is in
Standby Mode (unless an internal write operation is in
progress). Every communication session between host
and CAT15002/04 must be preceded by a high to low
transition and concluded with a low to high transition of
the C¯¯S input.
¯W¯P¯: The write protect input pin will allow all write
operations to the device when held high. When ¯W¯P¯
pin is tied low all write operations are inhibited.
DEVICE OPERATION
The CAT15002/04 products combine the accurate
voltage monitoring capabilities of a standalone voltage
supervisor with the high quality and reliability of
standard EEPROMs from Catalyst Semiconductor.
RESET CONTROLLER DESCRIPTION
The reset signal is asserted LOW for the CAT150xx9
and HIGH for the CAT150xx1 when the power supply
voltage falls below the threshold trip voltage and
remains asserted for at least 140ms (tPURST) after the
power supply voltage has risen above the threshold.
Reset output timing is shown in Figure 1.
The CAT15002/04 devices protect µPs against brown-out
failure. Short duration VCC transients of 4µsec or less and
100mV amplitude typically do not generate a Reset pulse.
VCC
VTH
VRVALID
RESE T
RESE T
t PURS T
t RPD
t PURS T
t RPD
CAT150xx9
Figure 1. RESET Output Timing
CAT150xx1
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 1126 Rev. A

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CAT15004 arduino
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CAT15002, CAT15004
READ OPERATIONS
Read from Memory Array
To read from memory, the host sends a READ
instruction followed by an 8-bit address (for the
CAT15008, bit 3 of the Read instruction opcode
contains address bit A8).
After receiving the last address bit, the CAT15002/04
will respond by shifting out data on the SO pin (as
shown in Figure 10). Sequentially stored data can be
read out by simply continuing to run the clock. The
internal address pointer is automatically incremented
to the next higher address as data is shifted out. After
reaching the highest memory address, the address
counter “rolls over” to the lowest memory address, and
the read cycle can be continued indefinitely. The read
operation is terminated by taking C¯¯S high.
Read Status Register
To read the status register, the host simply sends a
RDSR command. After receiving the last bit of the
command, the CAT15002/04 will shift out the contents
of the status register on the SO pin (Figure 11). The
status register may be read at any time, including
during an internal write cycle.
Figure 10. READ Timing
CS
SCK
SI
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
OPCODE
BYTE ADDRESS
0 0 0 0 X0* 0 1 1 A7 A6 A5 A4 A3 A2 A1 A0
SO HIGH IMPEDANCE
Notes:
* Please check the instruction set table for address
X = 0 for CAT15002; X=A8 for CAT15004
Dashed Line = mode (1, 1) - - - - - -
DATA OUT
D7 D6 D5 D4 D3 D2 D1 D0
MSB
Figure 11. RDSR Timing
CS
SCK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
OPCODE
SI 0 0 0 0 0
SO HIGH IMPEDANCE
Note: Dashed Line = mode (1, 1) - - - - - -
1 01
DATA OUT
7 6 5 4 3 2 10
MSB
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 1126 Rev. A

11 Page







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