DATASHEET
X5163, X5165
CPU Supervisor with 16Kbit SPI EEPROM
FN8128
Rev 4.00
August 13, 2015
Description
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 increases reliability.
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 oscillator to stabilize
before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcontroller
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 V
CC
detection circuitry protects the user’s
system from low voltage conditions, resetting the system when
V
CC
falls below the minimum V
CC
trip point. RESET/RESET is
asserted until V
CC
returns to proper operating level and
stabilizes. Five industry standard V
TRIP
thresholds are
available, however, Intersil’s unique circuits allow the
threshold to be reprogrammed to meet custom requirements
or to fine-tune the threshold for applications requiring higher
precision.
Features
• Selectable watchdog timer
• Low V
CC
detection and reset assertion
- Five standard reset threshold voltages
- Re-program low V
CC
reset threshold voltage using
special programming sequence
- Reset signal valid to V
CC
= 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 operation
• Available packages: 14 Ld TSSOP, 8 Ld SOIC, 8 Ld PDIP
• Pb-free plus anneal available (RoHS compliant)
Pinouts
8 Ld SOIC/PDIP
X5163, X5165
CS/WDI
SO
WP
V
SS
1
2
3
4
X5163, X5165
8
7
6
5
V
CC
RESET/RESET
SCK
SI
14 Ld TSSOP
X5163, X5165
CS/WDI
SO
NC
NC
NC
WP
V
SS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
RESET/RESET
NC
NC
NC
SCK
SI
FN8128 Rev 4.00
August 13, 2015
Page 1 of 22
X5163, X5165
Ordering Information
PART NUMBER
RESET
(ACTIVE LOW)
X5163PZ (Note)
PART
MARKING
X5163P Z
PART NUMBER
RESET
(ACTIVE HIGH)
X5165PZ (Note)
PART
MARKING
X5165P Z
V
CC
RANGE
(V)
4.5-5.5
TEMP
V
TRIP
RANGE RANGE (°C)
4.25-4.5
0 to 70
PACKAGE
(RoHS
Compliant)
8 Ld PDIP**
PKG.
DWG. #
MDP0031
(No longer available,
recommended
replacement:X5163S8Z)
X5163PIZ (Note)
X5163P Z I
(No longer available,
recommended
replacement:X5163S8IZ)
X5163S8Z* (Note) X5163 Z
(No longer available or
supported)
X5165PIZ (Note)
X5165P Z I
-40 to 85
8 Ld PDIP**
MDP0031
(No longer available or
supported)
X5165S8Z*
(Note)
X5165 Z
0 to 70
8 Ld SOIC
MDP0027
(No longer available or
supported)
X5163S8IZ*
(Note)
X5163 Z I
X5165S8IZ*
(Note)
X5165 Z I
-40 to 85
8 Ld SOIC
MDP0027
(No longer available or
supported)
X5163V14*
X5163V
X5165V14*
X5165V
0 to 70
14 Ld TSSOP
M14.173
(No longer available or
supported)
X5163PZ-2.7
(Note)
X5163P Z F
(No longer available or
supported)
X5165PZ-2.7
(Note)
X5165P Z F
2.7-5.5
2.55-2.7
0 to 70
8 Ld PDIP**
MDP0031
(No longer available,
recommended
replacement:X5163S8Z-2.7)
X5163PIZ-2.7
(Note)
X5163P Z G
(No longer available or
supported)
X5165PIZ-2.7
(Note)
X5165P Z G
-40 to 85
8 Ld PDIP**
MDP0031
(No longer available,
recommended
replacement:X5163S8IZ-2.7)
X5163S8Z-2.7*
(Note)
X5163 Z F
(No longer available or
supported)
X5165S8Z-2.7*
(Note)
X5165 Z F
0 to 70
8 Ld SOIC
MDP0027
(No longer available or
supported)
X5163S8IZ-2.7*
(Note)
X5163 Z G
X5165S8IZ-2.7*
(Note)
X5165 Z G
-40 to 85
8 Ld SOIC
MDP0027
(No longer available or
supported)
X5163PZ-2.7A
(Note)
X5163P Z AN X5165PZ-2.7A
(Note)
X5165P Z AN
2.7-5.5
2.85-3.0
0 to 70
8 Ld PDIP**
MDP0031
(No longer available,
recommended
replacement:X5163S8Z-2.7A)
X5163PIZ-2.7A
(Note)
(No longer available or
supported)
X5165P Z AP
-40 to 85
8 Ld PDIP**
MDP0031
X5163P Z AP X5165PIZ-2.7A
(Note)
(No longer available,
recommended
replacement:X5163S8IZ-2.7A)
(No longer available or
supported)
FN8128 Rev 4.00
August 13, 2015
Page 2 of 22
X5163, X5165
Ordering Information
(Continued)
PART NUMBER
RESET
(ACTIVE LOW)
X5163S8Z-2.7A*
(Note)
PART
MARKING
X5163 Z AN
PART NUMBER
RESET
(ACTIVE HIGH)
X5165S8Z-2.7A
(Note)
PART
MARKING
X5165 Z AN
V
CC
RANGE
(V)
2.7-5.5
TEMP
V
TRIP
RANGE RANGE (°C)
2.85-3.0
0 to 70
PACKAGE
(RoHS
Compliant)
8 Ld SOIC
PKG.
DWG. #
MDP0027
(No longer available or
supported)
X5163S8IZ-2.7A
(Note)
X5163 Z AP
X5165S8IZ-2.7A
(Note)
X5165 Z AP
-40 to 85
8 Ld SOIC
MDP0027
(No longer available or
supported)
X5163PZ-4.5A
(Note)
X5163P Z AL X5165PZ-4.5A
(Note)
X5165P Z AL
4.5-5.5
4.5-4.75
0 to 70
8 Ld PDIP**
MDP0031
(No longer available,
recommended
replacement:X5163S8Z-4.5A)
X5163PIZ-4.5A
(Note)
(No longer available or
supported)
X5165P Z AM
-40 to 85
8 Ld PDIP**
MDP0031
X5163P Z AM X5165PIZ-4.5A
(Note)
(No longer available,
recommended
replacement:X5163S8IZ-4.5A)
X5163S8Z-4.5A
(Note)
X5163 Z AL
(No longer available or
supported)
X5165S8Z-4.5A
(Note)
X5165 Z AL
0 to 70
8 Ld SOIC
MDP0027
(No longer available or
supported)
X5163S8IZ-4.5A
(Note)
X5163 Z AM
X5165S8IZ-4.5A
(Note)
X5165 Z AM
-40 to 85
8 Ld SOIC
MDP0027
(No longer available or
supported)
*Add "T1" suffix for tape and reel.
**Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
FN8128 Rev 4.00
August 13, 2015
Page 3 of 22
X5163, X5165
Block Diagram
Watchdog Transition
Detector
WP
SI
SO
SCK
CS/WDI
Data
Register
Command
Decode &
Control
Logic
V
CC
Threshold
Reset Logic
Protect Logic
RESET/RESET
Status
Register
EEPROM Array
4K Bits
4K Bits
8K Bits
Reset &
Watchdog
Timebase
X5163 = RESET
X5165 = RESET
Watchdog
Timer Reset
V
CC
V
TRIP
+
-
Power-on and
Low Voltage
Reset
Generation
Pin Description
PIN
(SOIC/PDIP)
1
PIN TSSOP
1
NAME
CS/WDI
FUNCTION
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 Watchdog 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.
Ground
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 output. 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 V
CC
falls below the minimum V
CC
sense level. It will remain active until V
CC
rises above
the minimum V
CC
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.
Supply Voltage
No internal connections
2
3
4
5
2
6
7
8
SO
WP
V
SS
SI
6
9
SCK
7
13
RESET/
RESET
8
14
3-5,10-12
V
CC
NC
FN8128 Rev 4.00
August 13, 2015
Page 4 of 22
X5163, X5165
Principles Of Operation
Power-on Reset
Application of power to the X5163, X5165 activates a Power-
on Reset Circuit. This circuit goes active at 1V and pulls the
RESET/RESET pin active. This signal prevents the system
microprocessor from starting to operate with insufficient voltage
or prior to stabilization of the oscillator. When V
CC
exceeds the
device V
TRIP
value for 200ms (nominal) the circuit releases
RESET/RESET, allowing the processor to begin executing code.
To set the new V
TRIP
voltage, apply the desired V
TRIP
threshold to the V
CC
pin and tie the CS/WDI pin and the WP
pin HIGH. RESET and SO pins are left unconnected. Then
apply the programming voltage V
P
to both SCK and SI and
pulse CS/WDI LOW then HIGH. Remove V
P
and the sequence
is complete.
CS
V
P
SCK
V
P
SI
Low Voltage Monitoring
During operation, the X5163, X5165 monitors the V
CC
level
and asserts RESET/RESET if supply voltage falls below a
preset minimum V
TRIP
. The RESET/RESET signal prevents
the microprocessor from operating in a power fail or brownout
condition. The RESET/RESET signal remains active until the
voltage drops below 1V. It also remains active until V
CC
returns
and exceeds V
TRIP
for 200ms.
FIGURE 1. SET V
TRIP
VOLTAGE
Watchdog Timer
The Watchdog Timer circuit monitors the microprocessor activity
by monitoring the WDI input. The microprocessor must toggle
the CS/WDI pin periodically to prevent a RESET/RESET
signal. The CS/WDI pin must be toggled from HIGH to LOW
prior to the expiration of the watchdog time out period. The
state of two nonvolatile control bits in the Status Register
determine the watchdog timer period. The microprocessor can
change these watchdog bits, or they may be “locked” by tying
the WP pin LOW and setting the WPEN bit HIGH.
Resetting the V
TRIP
Voltage
This procedure sets the V
TRIP
to a “native” voltage level. For
example, if the current V
TRIP
is 4.4V and the V
TRIP
is reset, the
new V
TRIP
is something less than 1.7V. This procedure must
be used to set the voltage to a lower value.
To reset the V
TRIP
voltage, apply a voltage between 2.7 and
5.5V to the V
CC
pin. Tie the CS/WDI pin, the WP pin, AND THE
SCK pin HIGH. RESET and SO pins are left unconnected. Then
apply the programming voltage V
P
to the SI pin ONLY and pulse
CS/WDI LOW then HIGH. Remove V
P
and the sequence is
complete.
V
CC
Threshold Reset Procedure
The X5163, X5165 has a standard V
CC
threshold (V
TRIP
)
voltage. This value will not change over normal operating and
storage conditions. However, in applications where the
standard V
TRIP
is not exactly right, or for higher precision in the
V
TRIP
value, the X5163, X5165 threshold may be adjusted.
CS
V
CC
SCK
Setting the V
TRIP
Voltage
This procedure sets the V
TRIP
to a higher voltage value. For
example, if the current V
TRIP
is 4.4V and the new V
TRIP
is 4.6V,
this procedure directly makes the change. If the new setting is
lower than the current setting, then it is necessary to reset the
trip point before setting the new value.
V
P
SI
FIGURE 2. RESET V
TRIP
VOLTAGE
FN8128 Rev 4.00
August 13, 2015
Page 5 of 22
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