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PDF ( 数据手册 , 数据表 ) X40620

零件编号 X40620
描述 Dual Voltage CPU Supervisor with 64K Serial EEPROM
制造商 Xicor
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X40620 数据手册, 描述, 功能
64K X40620
Dual Voltage CPU Supervisor with 64K Serial EEPROM
FEATURES
• Dual Voltage Detection and Reset Assertion
—Three standard reset threshold settings. (3.1V/
2.6V, 3.1V/1.7V, 2.9V/2.3V)
—Adjust low voltage reset threshold voltages
using special programming sequence
—RESET signal valid down to VCC=1V
• Watchdog Timer (150ms)
• Power On Reset (150ms)
• Low Power CMOS
—10µA typical standby current, watchdog on
—400µA typical standby current, watchdog off
• 64kbit 2-Wire Serial EEPROM
—1MHz serial interface speed
—64-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• 2.5 to 3.7V Power Supply Operation
• 8-Lead TSSOP package
DESCRIPTION
The X40620 combines several functions into one
device. The first is a dual voltage monitoring, power-on
reset control, watchdog timer and 64Kbit serial
EEPROM memory in one package. This combination
lowers system cost, reduces board space require-
ments, and increases reliability.
Applying voltage to VCC activates the power on reset
circuit which holds RESET active for a period of time.
This allows the power supply and system oscillator to
stabilize before the processor can execute code.
Low VCC detection circuitry protects the user’s system
from low voltage conditions, resetting the system when
VCC falls below the set minimum Vtrip point. RESET is
active until VCC returns to proper operating level and
stabilizes.
A second voltage monitor circuit (V2MON) tracks the
unregulated supply to provide a power fail warning or
monitors different power supply voltage. When the
second monitored voltage drops below a preset
V2TRIP voltage. V2FAIL is active until V2 returns to
proper operating level and above the V2TRIP voltage.
Five common low voltage combinations are available,
however, Xicor’s unique circuits allows the threshold
for either voltage monitor to be reprogrammed to meet
special needs or to fine-tune the threshold for applica-
tions requiring higher precision.
BLOCK DIAGRAM
WP
Write Control
Logic
SCL
SDA
Command
Decode
and
Control
Logic
HV Generation
Timing and Control
EEPROM Array
(64Kbits)
(VCC) Control Signal
Y Decoder
Data Register
Xicor, Inc. 2000 Patents Pending
9900-3003.5 4/24/00 EP
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
Power on and
Low Voltage
Reset
Generation
RESET
+
- V2TRIP
+
- VTRIP
V2FAIL
V2MON
VCC
Characteristics subject to change without notice. 1 of 17







X40620 pdf, 数据表
X40620
PROGRAM OPERATIONS
Memory Array Programming
The memory array program mode requires issuing the 8-bit
Write command followed by the address and then the data
bytes transferred as illustrated in Figure 9. Up to 64 bytes
(or more) may be transferred. Sending more than 64
bytes results in data wrapping and over-writing previ-
ous data. After the last byte to be transferred is
acknowledged a stop condition is issued which starts
the nonvolatile write cycle.
Figure 9. Memory Array Programming
SDA S
Write
Command
Data 0
•••
Data 63
Wait tWC
S Data ACK
Polling
ACK Polling
Once a stop condition is issued to indicate the end of
the host’s write sequence, the X40620 initiates the
internal nonvolatile write cycle. In order to take advan-
tage of the typical 5ms write cycle, ACK polling can
begin immediately. This involves issuing the start con-
dition followed by the new command code of 8 bits (1st
byte of the protocol.) If the X40620 is still busy with the
nonvolatile write operation, it will issue a “no-ACK” in
response. If the nonvolatile write operation has com-
pleted, an “ACK” will be returned and the host can then
proceed with the rest of the protocol.
Data ACK Polling Sequence
Write Sequence
Completed
Enter Ack Polling
Issue Start
Issue New
Command Code
ACK
Returned?
YES
Proceed
NO
Characteristics subject to change without notice. 8 of 17







X40620 equivalent, schematic
X40620
Ordering Information
VCC Range
2.5–3.7V
VTRIP
3.1
2.5–3.7V
3.1
V2TRIP
2.6
1.7
2.5–3.7V
2.9
2.3
Notes: Tolerance for VTRIP and V2TRIP are +/-5%
Package
8L TSSOP
8L TSSOP
8L TSSOP
Operating Temperature Range
0°C–70°C
-20°C–85°C
0°C–70°C
-20°C–85°C
0°C–70°C
-20°C–85°C
Part Number
X40620V8-3.1
X40620V8E-3.1
X40620V8-3.1A
X40620V8E-
3.1A
X40620V8-2.9
X40620V8E-2.9
Characteristics subject to change without notice. 16 of 17










页数 17 页
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