SPI EEPROM. X5165 Datasheet
CPU Supervisor with 16Kbit SPI EEPROM
|Total Page||21 Pages|
CPU Supervisor with 16Kbit SPI EEPROM
• Selectable watchdog timer
• Low VCC detection and reset assertion
—Five standard reset threshold voltages
—Re-program low VCC reset threshold voltage
using special programming sequence
—Reset signal valid to VCC = 1V
• Determine watchdog or low voltage reset with a
volatile ﬂag bit
• Long battery life with low power consumption
—<50µA max standby current, watchdog on
—<1µA max standby current, watchdog off
—<400µA max active current during read
• 16Kbits of EEPROM
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
Block Lock™ protection
—In circuit programmable ROM mode
• 2MHz SPI interface modes (0,0 & 1,1)
• Minimize EEPROM programming time
—32-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• 2.7V to 5.5V and 4.5V to 5.5V power supply
• Available packages
—14-lead TSSOP, 8-lead SOIC
These devices combine four popular functions, Power-
on Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Block Lock Protect Serial EEPROM
Memory in one package. This combination lowers
system cost, reduces board space requirements, and
Applying power to the device activates the power on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcon-
troller fails to restart a timer within a selectable time out
interval, the device activates the RESET/RESET signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even
after cycling the power.
The device’s low VCC detection circuitry protects the
user’s system from low voltage conditions, resetting the
system when VCC falls below the minimum VCC trip point.
RESET/RESET is asserted until VCC returns to proper
operating level and stabilizes. Five industry standard
VTRIP thresholds are available, however, Xicor’s unique
circuits allow the threshold to be reprogrammed to meet
custom requirements or to ﬁne-tune the threshold for
applications requiring higher precision.
Power on and
X5163 = RESET
X5165 = RESET
REV 1.1 3/5/01
Characteristics subject to change without notice. 1 of 21
X5163/X5165 – Preliminary Information
Chip Select Input. CS HIGH, deselects the device and the SO output pin is at
a high impedance state. Unless a nonvolatile write cycle is underway, the device
will be in the standby power mode. CS LOW enables the device, placing it in the
active power mode. Prior to the start of any operation after power up, a HIGH to
LOW transition on CS is required
Watchdog Input. A HIGH to LOW transition on the WDI pin restarts the Watch-
dog timer. The absence of a HIGH to LOW transition within the watchdog time
out period results in RESET/RESET going active.
Serial Output. SO is a push/pull serial data output pin. A read cycle shifts data out
on this pin. The falling edge of the serial clock (SCK) clocks the data out.
Write Protect. The WP pin works in conjunction with a nonvolatile WPEN bit to
“lock” the setting of the Watchdog Timer control and the memory write protect bits.
Serial Input. SI is a serial data input pin. Input all opcodes, byte addresses, and
memory data on this pin. The rising edge of the serial clock (SCK) latches the input
data. Send all opcodes (Table 1), addresses and data MSB ﬁrst.
Serial Clock. The Serial Clock controls the serial bus timing for data input and out-
put. The rising edge of SCK latches in the opcode, address, or data bits present on
the SI pin. The falling edge of SCK changes the data output on the SO pin.
Reset Output. RESET/RESET is an active LOW/HIGH, open drain output which
goes active whenever VCC falls below the minimum VCC sense level. It will remain
active until VCC rises above the minimum VCC sense level for 200ms. RESET/
RESET goes active if the Watchdog Timer is enabled and CS remains either
HIGH or LOW longer than the selectable Watchdog time out period. A falling
edge of CS will reset the Watchdog Timer. RESET/RESET goes active on power
up at 1V and remains active for 200ms after the power supply stabilizes.
No internal connections
3 X5163/65 6
REV 1.1 3/5/01
Characteristics subject to change without notice. 2 of 21
|Features||Datasheet pdf Preliminary Information Replaces X25163/ X25165 X5163/X5165 CPU Supervisor with 16Kbit SPI EEPROM FEATURES • Selecta ble watchdog timer • Low VCC detectio n and reset assertion —Five standard reset threshold voltages —Re-program low VCC reset threshold voltage using s pecial programming sequence —Reset si gnal valid to VCC = 1V • Determine wa tchdog or low voltage reset with a vola tile ﬂag bit • Long battery life wi th low power consumption —<50µA max standby current, watchdog on —<1µA m ax standby current, watchdog off —<40 0µA max active current during read • 16Kbits of EEPROM • Built-in inadver tent write protection —Power-up/power -down protection circuitry —Protect 0 , 1/4, 1/2 or all of EEPROM array with Block Lock™ protection —In circuit programmable ROM mode • 2MHz SPI inte rface modes (0,0 & 1,1) • Minimize EE PROM programming time —32-byte page w rite mode —Self-timed write cycle — 5ms write cycle time (typical) • 2.7V to 5.5V and 4.5V to 5.5V power supply operation • Available packages —14.|
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