DATASHEET

X55060
®
64K
Data Sheet
PRELIMINARY
March 28, 2005
Dual Voltage Monitor with Integrated
System Battery Switch and EEPROM
FN8133.0
—In circuit programmable ROM mode
• Minimize EEPROM programming time
—64 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• 10MHz SPI interface modes (0,0 & 1,1)
• 2.7V to 5.5V power supply operation
• Available packages — 20-lead TSSOP
FEATURES
• Dual voltage monitoring
• Active high and active low reset outputs
• Four standard reset threshold voltages
(4.6/2.9, 4.6/2.6, 2.9/1.6, 2.6/1.6)
—User programmable thresholds
• Lowline Output — Zero delayed POR
• Reset signal valid to VCC = 1V
• System battery switch-over circuitry
• Long battery life with low power consumption
—<50µA max standby current, watchdog on
—<30µA max standby current, watchdog off
• Selectable watchdog timer
—(0.15s, 0.4s, 0.8s, off)
• 64Kbits of EEPROM
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect none(0), or all of EEPROM array with
programmable Block Lock™ protection
DESCRIPTION
This device combines power-on reset control, battery
switch circuit, watchdog timer, supply voltage supervision, secondary voltage supervision, block lock protect
and serial EEPROM 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.
BLOCK DIAGRAM
VOUT
V2MON
V2 Monitor
Logic
VTRIP2
-
Watchdog Transition
Detector
Watchdog
Timer Reset
WP
WDO
Protect Logic
Command
Decode, Test
& Control
Logic
SCK
X-Decoder
Data
Register
SO
SI
RESET
Status
Register
EEPROM Array
Reset &
Watchdog
Timebase
BATT-ON
512 X 128
CS
VOUT
VBATT
V2FAIL
+
RESET/MR
System
Battery
Switch
VOUT
VCC
(V1MON)
VCC Monitor
Logic
1
+
VTRIP1
-
Power-on,
Low Voltage
Reset
Generation
LOWLINE
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X55060
A system battery switch circuit compares VCC (V1MON)
with VBATT input and connects VOUT to whichever is
higher. This provides voltage to external SRAM or other
circuits in the event of main power failure. The X55060
can drive 50mA from VCC and 250µA from VBATT. The
device switches to VBATT when VCC drops below the
low VCC voltage threshold and VBATT > VCC.
supply or monitors a second power supply voltage to
provide a power fail warning. Intersil’s unique circuits
allow the threshold for either voltage monitor to be
reprogrammed to meet special needs or to fine-tune the
threshold for applications requiring higher precision.
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 WDO signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even
after cycling the power.
X55060
ORDERING INFORMATION
Suffix
V20-4.5A
V20I-4.5A
V20-4.5
V20I-4.5
The device’s low VCC detection circuitry protects the
user’s system from low voltage conditions, resetting the
system when VCC (V1MON) falls below the minimum
VCC trip point (VTRIP1). RESET/RESET is asserted until
VCC returns to proper operating level and stabilizes. A
second voltage monitor circuit tracks the unregulated
V20-2.7A
V20I-2.7A
V20-2.7
V20I-2.7
Vtrip1
Vtrip2
4.6
2.6
4.6
2.9
2.9
1.65
2.6
1.65
Temp Range
0°C to 70°C
-40°C to 85°C
0°C to 70°C
-40°C to 85°C
0°C to 70°C
-40°C to 85°C
0°C to 70°C
-40°C to 85°C
PIN CONFIGURATION
20-Pin TSSOP
2
CS/WDI
1
20
VCC (V1MON)
NC
2
19
WDO
SO
3
18
RESET/MR
RESET
4
17
BATT-ON
LOWLINE
5
16
VOUT
V2FAIL
6
15
VBATT
V2MON
7
14
SCK
WP
8
13
NC
NC
9
12
NC
VSS
10
11
SI
FN8133.0
March 28, 2005
X55060
PIN DESCRIPTION
Pin
Name
Function
1
CS/WDI
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.
2
NC
No internal connections
3
SO
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.
4
RESET
5
LOWLINE
6
V2FAIL
V2 Voltage Fail Output. This open drain output goes LOW when V2MON is less than VTRIP2
and goes HIGH when V2MON exceeds VTRIP2. There is no power-up reset delay circuitry on this
pin.
7
V2MON
V2 Voltage Monitor Input. When the V2MON input is less than the VTRIP2 voltage, V2FAIL goes
LOW. This input can monitor an unregulated power supply with an external resistor divider or can
monitor a second power supply with no external components. Connect V2MON to VSS or VCC
when not used.
8
WP
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.
9
NC
No internal connections
10
VSS
Ground
11
SI
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.
12
NC
No internal connections
13
NC
No internal connections
14
SCK
15
VBATT
Reset Output. RESET is an active HIGH, open drain output which is the inverse of the RESET
output.
Low VCC Detect. This open drain output signal goes LOW when VCC < VTRIP1 and
immediately goes HIGH when VCC > VTRIP1. This pin goes LOW 250ns before RESET pin.
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.
Battery Supply Voltage. This input provides a backup supply in the event of a failure of the primary VCC voltage. The VBATT voltage typically provides the supply voltage necessary to maintain
the contents of SRAM and also powers the internal logic to “stay awake.” If unused connect
VBATT to ground.
3
FN8133.0
March 28, 2005
X55060
PIN DESCRIPTION (CONTINUED)
Pin
Name
Function
16
VOUT
17
BATT-ON
Battery On. This open drain output goes HIGH when the VOUT switches to VBATT and goes LOW
when VOUT switches to VCC. It is used to drive an external PNP pass transistor when VCC = VOUT
and current requirements are greater than 50mA.
The purpose of this output is to drive an external transistor to get higher operating currents when
the VCC supply is fully functional. In the event of a VCC failure, the battery voltage is applied to
the VOUT pin and the external transistor is turned off. In this “backup condition,” the battery only
needs to supply enough voltage and current to keep SRAM devices from losing their data-there
is no communication at this time.
18
RESET
/MR
Output/Manual Reset Input. This is an Input/Output pin.
RESET Output. This is an active LOW, open drain output which goes active whenever VCC falls
below the minimum VCC sense level. When RESET is active communication to the device is interrupted. RESET remains active until VCC rises above the minimum VCC sense level for 150ms.
RESET also goes active on power-up and remains active for 150ms after the power supply
stabilizes.
MR Input. This is an active LOW debounced input. When MR is active, the RESET/RESET pins
are asserted. When MR is released, the RESET/RESET remains asserted for tPURST, and then released.
19
WDO
Watchdog Output. WDO is an active low, open drain output which goes active whenever the
watchdog timer goes active. WDO remains active for 150ms, then returns to the inactive state.
20
VCC
(V1MON)
Supply Voltage/V1 Voltage Monitor Input. When the V1MON input is less than the VTRIP1
voltage, RESET and RESET go ACTIVE.
Output Voltage. VOUT = VCC if VCC > VTRIP1.
IF VCC < VTRIP1, then,
VOUT = VCC if VCC > VBATT+0.03
VOUT = VBATT if VCC < VBATT-0.03
Note: There is hysteresis around VBATT ± 0.03V point to avoid oscillation at or near the
switchover voltage. A capacitance of 0.1µF must be connected to Vout to ensure stability.
PRINCIPLES OF OPERATION
Power-On Reset
Application of power to the X55060 activates a Poweron Reset Circuit. This circuit goes active at about 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 VCC exceeds the device VTRIP1
value for 150ms (nominal) the circuit releases
RESET/RESET, allowing the processor to begin executing code.
Low VCC (V1MON) Voltage Monitoring
During operation, the X55060 monitors the VCC level
and asserts RESET/RESET if supply voltage falls
below a preset minimum VTRIP1. During this time the
communication to the device is interrupted. The
4
RESET/RESET signal also prevents the microprocessor from operating in a power fail or brownout condition. The RESET signal remains active until the
voltage drops below 1V. These also remain active until
VCC returns and exceeds VTRIP1 for tPURST.
Low V2MON Voltage Monitoring
The X55060 also monitors a second voltage level and
asserts V2FAIL if the voltage falls below a preset minimum VTRIP2. The V2FAIL signal is either ORed with
RESET to prevent the microprocessor from operating
in a power fail or brownout condition or used to interrupt the microprocessor with notification of an impending power failure. V2FAIL remains active until V2MON
returns and exceeds VTRIP2.
The V2MON voltage sensor is powered by VOUT. If
VCC and VBATT go away (i.e. VOUT goes away), then
V2MON cannot be monitored.
FN8133.0
March 28, 2005
X55060
Figure 1. Two Uses of Dual Voltage Monitoring
X55060
VOUT
VOUT
X55060
Unregulated
Supply
5V
Reg
VCC
RESET
R1
R2
V2
V2MON
V2FAIL
System
Reset
5V
Reg
System
Interrupt
R1 and R2 selected so V2 = V2MON threshold when
Unregulated supply reaches 6V.
Watchdog Timer
The Watchdog Timer circuit monitors the microprocessor activity by monitoring the CS/WDI pin. The microprocessor must toggle the CS/WDI pin HIGH to LOW
periodically prior to the expiration of the watchdog time
out period to prevent the WDO signal going active.
The state of two nonvolatile control bits in the Status
Register determines the watchdog timer period. The
microprocessor can change these watchdog bits by
writing to the status register. The factory default setting disables the watchdog timer.
The Watchdog Timer oscillator stops when in battery
backup mode. It re-starts when VCC returns.
System Battery Switch
As long as VCC exceeds the low voltage detect threshold VTRIP1, VOUT is connected to VCC through a 5Ω
(typical) switch. When the VCC has fallen below VTRIP,
then VCC is applied to VOUT if VCC is equal to or
greater than VBATT + 0.03V. When VCC drops to less
than VBATT - 0.03V, then VOUT is connected to VBATT
through an 80Ω (typical) switch. VOUT typically supplies the system static RAM voltage, so the switchover
circuit operates to protect the contents of the static
RAM during a power failure. Typically, when VCC has
failed, the SRAMs go into a lower power state and
draw much less current than in their active mode.
When VCC returns, VOUT switches back to VCC when
VCC exceeds VBATT + 0.03V. There is a 60mV hysteresis around this battery switch threshold to prevent
oscillations between supplies.
5
Unregulated
Supply
3.3V
Reg
VCC
RESET
V2MON
V2FAIL
System
Reset
Notice: No external components required to monitor
two voltages.
While VCC is connected to VOUT the BATT-ON pin is
pulled LOW. The signal can drive an external PNP
transistor to provide additional current to the external
circuits during normal operation.
Operation
The device is in normal operation with VCC as long as
VCC > VTRIP1. It switches to the battery backup mode
when VCC goes away.
Condition
Mode of Operation
VCC > VTRIP1
Normal Operation.
VCC > VTRIP1 &
VBATT = 0
Normal Operation without battery
back up capability.
0 ≤ VCC VTRIP1
and VCC < VBATT
Battery Backup Mode; RESET
signal is asserted. No communication to the device is allowed.
FN8133.0
March 28, 2005
X55060
the programming voltage VP. Then, send the WREN
command and write to address 01h or to address 0Bh
to program VTRIP1 or VTRIP2, respectively (followed by
data byte 00h). The CS going high after a valid write
operation initiates the programming sequence. Bring
WP LOW to complete the operation.
Manual Reset
By connecting a push-button from MR to ground or
driven by logic, the designer adds manual system reset
capability. The RESET/RESET pins are asserted when
the push-button is closed and remain asserted for tPURST
after the push-button is released. This pin is debounced
so a push-button connected directly to the device will
have both clean falling and rising edges on MR.
To check if the VTRIPX has been set, apply a voltage
higher than VTRIPX to the VXMON (x = 1, 2) pin. Decrement VXMON in small steps and observe where the
output switches. The voltage at which this occurs is
the VTRIPX (actual).
VCC (V1MON), V2MON Threshold Programming
Procedure
The X55060 is shipped with standard VCC (V1MON)
and V2MON threshold (VTRIP1, VTRIP2) voltages.
These values will not change over normal operating
and storage conditions. However, in applications where
the standard thresholds are not exactly right, or if higher
precision is needed in the threshold value, the X55060
trip points may be adjusted. The procedure is described
below, and uses the application of a high voltage control signal.
CASE A
If the VTRIPX (actual) is lower than the VTRIPX
(desired), then add the difference between VTRIPX
(desired) and VTRIPX (actual) to the original VTRIPX
(desired). This is your new VTRIPX voltage that should
be applied to VXMON and the whole sequence
repeated again (see Fig 6).
Setting the VTRIP Voltage
CASE B
This procedure is used to set the VTRIP1 or VTRIP2 to a
lower or higher voltage value. It is necessary to reset
the trip point before setting the new value to a lower
level.
If the VTRIPX (actual) is higher than the VTRIPX
(desired), perform the reset sequence as described in
the next section. The new VTRIPX voltage to be applied
to VXMON will now be: VTRIPX (desired) - (VTRIPX
(desired) - VTRIPX (actual)).
To set the new voltage, apply the desired VTRIP1
threshold voltage to the VCC pin or the VTRIP2 voltage
to the V2MON pin (when setting VTRIP2, VCC should
be same voltage as V2MON). Next, tie the WP pin to
Note: This operation will not alter the contents of the
EEPROM.
Figure 2. Example System Connection
Unregulated
Supply
PNP transistor
or P-channel FET
5V
Reg
VCC
BATT-ON
SRAM
VOUT
VOUT
VBATT
Address
Decode
V2MON
+
V2FAIL
Enable
NMI
RESET
VSS
6
CS, SCK
SI, SO
Addr
VCC
RESET
SPI µC
FN8133.0
March 28, 2005
X55060
Resetting the VTRIP Voltage
To reset VTRIP1, apply greater than 3V to VCC
(V1MON). To reset VTRIP2, apply greater than 3V to
both VCC and V2MON. Next, tie the WP pin to the
programming voltage VP. Then send the WREN
command and write to address 03h or 0Dh to reset the
VTRIP1 or VTRIP2 respectively (followed by data byte
00h). The CS going LOW to HIGH after a valid write
operation initiates the programming sequence. Bring
WP LOW to complete the operation.
Note: This operation does not change the contents of
the EEPROM array.
Figure 3. Set VTRIPX Level Sequence
VP = 10-15V
WP
CS
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7 8 9 10
20 21 22 23
SCK
16 Bits
SI
02h
WRITE
06h
WREN
0001h/000Bh
ADDRESS
Addr 01h: Set VTRIP1
Addr 0Bh: Set VTRIP2
00h
DATA
Figure 4. Reset VTRIPX Level Sequence
VP = 10-15V
WP
CS
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7 8 9 10
20 21 22 23
SCK
16 Bits
SI
02h
WRITE
06h
WREN
7
0003h/000Dh
ADDRESS
Addr 03h: Reset VTRIP1
Addr 0Dh: Reset VTRIP2
00h
DATA
FN8133.0
March 28, 2005
X55060
Figure 5. Sample VTRIP Circuit
4.7K
VP
Adjust
VTRIP
Adj.
Run
X55060
VCC
CS
RESET
SO
SCK
WP
VSS
SI
RESET
µC
SCK
SI
SO
CS
Figure 6. VTRIP Programming Sequence Flow Chart
Vx = VxMON
Note: X = 1, 2
Let: MDE = Maximum Desired Error
VTRIPX Programming
No
Desired
VTRIPX <
Present Value?
MDE+
Acceptable
Desired Value
YES
Error Range
Execute
VTRIPX Reset Sequence
MDE–
Error = Actual - Desired
Set
VX = desired VTRIPX
New VX applied =
Old VX applied + | Error |
Execute
Set Higher VTRIPX Sequence
New VX applied =
Old VX applied - | Error |
Apply VCC and Voltage
> Desired VTRIPX to VX
Execute Reset VTRIPX
Sequence
NO
Decrease VX
Output Switches?
YES
Error < MDE–
Actual VTRIPX Desired VTRIPX
Error > MDE+
| Error | < | MDE |
DONE
8
FN8133.0
March 28, 2005
X55060
SPI SERIAL MEMORY
Write Enable Latch
The memory portion of the device is a CMOS Serial
EEPROM array with Intersil’s block lock protection. The
array is internally organized as x 8. The device features
a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple four-wire bus.
The device contains a Write Enable Latch. This latch
must be SET before a Write Operation is initiated. The
WREN instruction sets the latch and the WRDI instruction resets the latch (Figure 9). This latch is automatically reset upon a power-up condition and after the
completion of a valid Write Cycle.
The device utilizes Intersil’s proprietary Direct Write™
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
Status Register
The RDSR instruction provides access to the Status
Register. The Status Register may be read at any
time, even during a Write Cycle. The Status Register
is formatted as follows:
The device is designed to interface directly with the
synchronous Serial Peripheral Interface (SPI) of many
popular microcontroller families. It contains an 8-bit
instruction register that is accessed via the SI input,
with data being clocked in on the rising edge of SCK.
CS must be LOW during the entire operation.
7
WPEN
All instructions (Table 1), addresses and data are
transferred MSB first. Data input on the SI line is
latched on the first rising edge of SCK after CS goes
LOW. Data is output on the SO line by the falling edge
of SCK. SCK is static, allowing the user to stop the
clock and then start it again to resume operations
where left off.
6
5
4
WD1 WD0 PUP
3
2
BL1
BL0
1
0
WEL WIP
The Write-In-Progress (WIP) bit is a volatile, read only
bit and indicates whether the device is busy with an
internal nonvolatile write operation. The WIP bit is read
using the RDSR instruction. When set to a “1”, a nonvolatile write operation is in progress. When set to a
“0”, no write is in progress.
Table 1. Instruction Set
Instruction Name
Instruction Format*
WREN
0000 0110
Set the Write Enable Latch (Enable Write Operations)
WRDI
0000 0100
Reset the Write Enable Latch
RSDR
0000 0101
Read Status Register
WRSR
0000 0001
Write Status Register (Watchdog, block lock, WPEN)
READ
0000 0011
Read Data from Memory Array Beginning at Selected Address
WRITE
0000 0010
Write Data to Memory Array Beginning at Selected Address
Note:
Operation
*Instructions are shown MSB in leftmost position. Instructions are transferred MSB first.
Table 2. Block Protect Matrix
WREN CMD
Status Register
Device Pin
Block
Block
Status Register
WEL
WPEN
WP
Protected Block
Unprotected Block
WPEN, BL0, BL1,
PUP, WD0, WD1
0
X
X
Protected
Protected
Protected
1
1
0
Protected
Writable
Protected
1
0
X
Protected
Writable
Writable
1
X
1
Protected
Writable
Writable
9
FN8133.0
March 28, 2005
X55060
The Watchdog Timer bits, WD0 and WD1, select the
Watchdog Time-out Period. These nonvolatile bits are
programmed with the WRSR instruction.
The Write Enable Latch (WEL) bit indicates the Status
of the Write Enable Latch. When WEL = 1, the latch is
set HIGH and when WEL = 0 the latch is reset LOW.
The WEL bit is a volatile, read only bit. It can be set by
the WREN instruction and can be reset by the WRDS
instruction.
Status Register Bits
The block lock bits, BL0 and BL1, set the level of block
lock protection. These nonvolatile bits are programmed using the WRSR instruction and allow the
user to protect one quarter, one half, all or none of the
EEPROM array. Any portion of the array that is block
lock protected can be read but not written. It will
remain protected until the BL bits are altered to disable
block lock protection of that portion of memory.
Status Register Bits
BL0
X55060
0
0
None (factory setting)
0
1
None
1
0
None
1
1
0000h–1FFFh (All)
WD0
Watchdog Time Out
(Typical)
0
0
800 milliseconds
0
1
400 milliseconds
1
0
150 milliseconds
1
1
disabled (factory setting)
The nonvolatile WPEN bit is programmed using the
WRSR instruction. This bit works in conjunction with
the WP pin to provide an In-Circuit Programmable
ROM function (Table 2). WP tied to VSS and WPEN bit
programmed HIGH disables all Status Register Write
Operations.
Array Addresses Protected
BL1
WD1
Note 1. Watchdog timer is shipped disabled.
2. The tPURST time is set to 150ms at the factory.
In Circuit Programmable ROM Mode
This mechanism protects the block lock and Watchdog
bits from inadvertent corruption.
The power-on reset time (tPURST) bit, PUP sets the
initial power or reset time. There are two standard
settings.
PUP
Time
0
150 milliseconds (factory settings)
1
800 milliseconds
In the locked state (Programmable ROM Mode) the
WP pin is LOW and the nonvolatile bit WPEN is “1”.
This mode disables nonvolatile writes to the device’s
Status Register.
Setting the WP pin LOW while WPEN is a “1” while an
internal write cycle to the Status Register is in progress
will not stop this write operation, but the operation disables subsequent write attempts to the Status Register.
Figure 7. Read EEPROM Array Sequence
CS
0
1
2
3
4
5
6
7
8
9
10
20 21 22 23 24 25
26 27 28 29 30
SCK
Instruction
16 Bit Address
15 14 13
SI
3
2
1
0
Data Out
High Impedance
SO
7
6
5
4
3
2
1
0
MSB
10
FN8133.0
March 28, 2005
X55060
When WP is HIGH, all functions, including nonvolatile
writes to the Status Register operate normally. Setting
the WPEN bit in the Status Register to “0” blocks the
WP pin function, allowing writes to the Status Register
when WP is HIGH or LOW. Setting the WPEN bit to
“1” while the WP pin is LOW activates the Programmable ROM mode, thus requiring a change in the WP pin
prior to subsequent Status Register changes. This
allows manufacturing to install the device in a system
with WP pin grounded and still be able to program the
Status Register. Manufacturing can then load Configuration data, manufacturing time and other parameters
into the EEPROM, then set the portion of memory to
be protected by setting the block lock bits, and finally
set the “OTP mode” by setting the WPEN bit. Data
changes to protected areas of the device now require
a hardware change.
Read Sequence
When reading from the EEPROM memory array, CS is
first pulled low to select the device. The 8-bit READ
instruction is transmitted to the device, followed by the
16-bit address. After the READ opcode and address
are sent, the data stored in the memory at the selected
address is shifted out on the SO line. The data stored in
memory at the next address can be read sequentially
by continuing to provide clock pulses. The address is
automatically incremented to the next higher address
after each byte of data is shifted out. The read operation
is terminated by taking CS high. Refer to the Read
EEPROM Array Sequence (Figure 7).
To read the Status Register, the CS line is first pulled
low to select the device followed by the 8-bit RDSR
instruction. After the RDSR opcode is sent, the contents
of the Status Register are shifted out on the SO line.
Refer to the Read Status Register Sequence (Figure 8).
Refer to the Serial Output Timing on page 18.
Write Sequence
Prior to any attempt to write data into the device, the
“Write Enable” Latch (WEL) must first be set by issuing the WREN instruction (Figure 9). CS is first taken
LOW, then the WREN instruction is clocked into the
device. After all eight bits of the instruction are transmitted, CS must then be taken HIGH. If the user continues the Write Operation without taking CS HIGH
after issuing the WREN instruction, the Write Operation will be ignored.
11
To write data to the EEPROM memory array, the user
then issues the WRITE instruction followed by the 16
bit address and then the data to be written. Any
unused address bits are specified to be “0’s”. The
WRITE operation minimally takes 32 clocks. CS must
go low and remain low for the duration of the operation. If the address counter reaches the end of a page
and the clock continues, the counter will roll back to
the first address of the page and overwrite any data
that may have been previously written.
For the Page Write Operation (byte or page write) to
be completed, CS can only be brought HIGH after bit 0
of the last data byte to be written is clocked in. If it is
brought HIGH at any other time, the write operation
will not be completed (Figure 10).
To write to the Status Register, the WRSR instruction
is followed by the data to be written (Figure 11).
While the write is in progress following a Status Register or EEPROM Sequence, the Status Register may
be read to check the WIP bit. During this time the WIP
bit will be high. Refer to Serial Input timing on page 17.
OPERATIONAL NOTES
The device powers-up in the following state:
– The device is in the low power standby state.
– A HIGH to LOW transition on CS is required to enter
an active state and receive an instruction.
– SO pin is high impedance.
– The Write Enable Latch is reset.
– Reset Signal is active for tPURST.
Data Protection
The following circuitry has been included to prevent
inadvertent writes:
– A WREN instruction must be issued to set the Write
Enable Latch.
– A valid write command and address must be sent to
the device.
– CS must come HIGH after a multiple of 8 data bits in
order to start a nonvolatile write cycle.
FN8133.0
March 28, 2005
X55060
Figure 8. Read Status Register Sequence
CS
0
1
2
3
4
5
6
7
8
9
10
11 12 13 14
SCK
Instruction
SI
Data Out
SO
High Impedance
7
6
5
4
3
2
1
0
MSB
Figure 9. Write Enable Latch Sequence
CS
0
1
2
3
4
5
6
7
SCK
SI
SO
12
High Impedance
FN8133.0
March 28, 2005
X55060
Figure 10. Write Sequence
CS
0
1
2
3
4
5
6
7
8
9
20 21 22 23 24 25 26 27 28 29 30 31
10
SCK
Instruction
16 Bit Address
15 14 13
SI
3
Data Byte 1
2
1
0
7
6
5
4
3
2
1
0
CS
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
SCK
Data Byte 2
SI
7
6
5
4
3
Data Byte 3
2
1
0
7
6
5
4
3
Data Byte N
2
1
6
0
5
4
3
2
1
0
Figure 11. Status Register Write Sequence
CS
0
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15
SCK
Instruction
Data Byte
7
SI
6
5
4
3
2
1
0
High Impedance
SO
Symbol Table
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from LOW
to HIGH
Will change
from LOW
to HIGH
May change
from HIGH
to LOW
Will change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
13
FN8133.0
March 28, 2005
X55060
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias ................... -65°C to +135°C
Storage temperature ........................ -65°C to +150°C
Voltage on any pin with
respect to VSS ...................................... -1.0V to +7V
D.C. output current
(all output pins except VOUT)............................. 5mA
D.C. Output Current VOUT .................................. 50mA
Lead temperature (soldering, 10 seconds) ........ 300°C
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only; the functional operation of the
device (at these or any other conditions above those
listed in the operational sections of this specification) is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min.
0°C
-40°C
Max.
70°C
+85°C
D.C. OPERATING CHARACTERISTICS
(Over recommended operating conditions unless otherwise specified. (VCC = 2.7V to 5.5V))
Limits
Symbol
Parameter
ICC1(1)
VCC Supply Current (Active)
(Excludes IOUT) Read Memory array
(Excludes IOUT) Write nonvolatile Memory
ICC2(2)
ICC3(1)
IBATT1(3)(7
)
Min.
Typ.(5)
Max.
Unit
Test Conditions
mA
SCK = VCC x 0.1/VCC x
0.9 @ 10MHz
µA
CS = VCC, Any Input =
VSS or VCC, VOUT,
RESET, RESET,
LOWLINE = Open
1.5
3.0
VCC Supply Current (Passive)
(Excludes IOUT) WDT on, 5V
(Excludes IOUT) WDT on, 2.7V
(Excludes IOUT) WDT off, 5V
50.0
40.0
30.0
90.0
60.0
50.0
VCC Current (Battery Backup Mode)
(Excludes IOUT)
1
µA
VCC = 2V, VBATT =
2.8V, VOUT, RESET =
Open
VBATT Current (Excludes IOUT)
1
µA
VOUT = VBt
1.0
µA
VOUT = VBATT,
VBATT = 2.8V
VOUT, RESET = Open
VCC-0.02
VCC-0.2
V
V
IOUT = -5mA
IOUT = -50mA
V
V
IOUT = -250µA
IOL = 3.0mA (5V)
IOL = 1.0mA (3V)
IBATT2(7)
VBATT Current (Excludes IOUT) (Battery
Backup Mode)
VOUT1(7)
Output Voltage (VCC > VBATT + 0.03V or
VCC > VTRIP1)
VCC - 0.05
VCC - 0.5
VOUT2(7)
Output Voltage (VCC < VBATT -0.03V and
VCC < VTRIP1) {Battery Backup}
VBATT - 0.2
0.4
VOLB
Output (BATT-ON) LOW Voltage
0.4
V
VBSH
Battery Switch Hysteresis
(VCC < VTRIP1)
30
-30
mV
mV
4.75
V
-4.5A and -4.5 versions
2.85
3.0
V
-2.7A version
2.55
2.75
V
-2.7 version
0.4
V
IOL = 3.0mA (5V)
IOL = 1.0mA (3V)
Power-up
Power-down
RESET/RESET/LOWLINE/WDO
VTRIP1(6)
VOLR
VCC Reset Trip Point Voltage
Output (RESET, RESET, LOWLINE,
WDO) LOW Voltage
14
4.5
4.62
FN8133.0
March 28, 2005
X55060
D.C. OPERATING CHARACTERISTICS (CONTINUED)
(Over recommended operating conditions unless otherwise specified. (VCC = 2.7V to 5.5V))
Limits
Symbol
Parameter
Typ.(5)
Max.
Unit
2.85
3.0
V
-4.5 version
2.55
2.7
V
-4.5A version
1.6
1.7
V
-2.7A and -2.7 version
0.4
V
IOL = 3.0mA (5V)
IOL = 1.0mA (3V)
V
Min.
Test Conditions
Second Supply Monitor
VTRIP2(6)
VOLx
V2MON Reset Trip Point Voltage
Output (V2FAIL) LOW Voltage
SPI Interface
VILx(4)
Input (CS, SI, SCK, WP) LOW Voltage
-0.5
VCC x 0.3
(4)
Input (CS, SI, SCK, WP) HIGH Voltage
VCC x 0.7
VIHx
VCC + 0.5
V
Input Leakage Current (CS, SI, SCK,WP)
±10
µA
VOLS
Output (SO) LOW Voltage
0.4
V
IOL = 3.0mA (5V)
IOL = 1.0mA (3V)
VOHS
Output (SO) HIGH Voltage
V
IOH = -1.0mA (5V)
ILIx
VOUT - 0.8
Notes: (1) The device enters the Active state after any start, and remains active until 9 clock cycles later if the Device Select Bits in the Slave
Address Byte are incorrect; 200ns after a stop ending a read operation; or tWC after a stop ending a write operation.
(2) The device goes into Standby: 200ns after any Stop, except those that initiate a high voltage write cycle; tWC after a stop that initiates a
high voltage cycle; or 9 clock cycles after any start that is not followed by the correct Device Select Bits in the Slave Address Byte.
(3) Negative number indicate charging current, Positive numbers indicate discharge current.
(4) VIL min. and VIH max. are for reference only and are not tested.
(5) VCC = 5V at 25°C.
(6) VTRIP1 and VTRIP2 are programmable. See page 22 and 23 for programming specifications and pages 6, 7 and 8 for programming procedure. For custom programmed levels, contact factory.
(7) Based on characterization data.
CAPACITANCE TA = +25°C, f = 1MHz, VCC = 5V
Symbol
COUT(1)
CIN(1)
Note:
Test
Output Capacitance (SO, RESET, V2FAIL, RESET, LOWLINE, BATT-ON,WDO)
Input Capacitance (SCK, SI, CS, WP)
Max.
8
Unit
pF
Conditions
VOUT = 0V
6
pF
VIN = 0V
(1) This parameter is periodically sampled and not 100% tested.
15
FN8133.0
March 28, 2005
X55060
EQUIVALENT A.C. LOAD CIRCUIT AT 5V VCC
VOUT
VOUT
1.53kΩ
2.06kΩ
A.C. TEST CONDITIONS
Input pulse levels
VCC x 0.1 to VCC x 0.9
Input rise and fall times
10ns
Input and output timing level
VCC x0.5
RESET/RESET
BATT-ON/LOWLINE/
V2FAIL, WDO
SO
3.03kΩ
30pF
30pF
A.C. CHARACTERISTICS (Over recommended operating conditions, unless otherwise specified)
Serial Input Timing
VCC = 2.7-5.5V
Symbol
Parameter
Min.
Max.
Unit
10
MHz
fSCK
Clock Frequency
tCYC
Cycle Time
100
ns
tLEAD
CS Lead Time
50
ns
tLAG
CS Lag Time
200
ns
tWH
Clock HIGH Time
40
ns
tWL
Clock LOW Time
40
ns
tSU
Data Setup Time
10
ns
tH
Data Hold Time
10
ns
tRI(3)
Input Rise Time
20
ns
Input Fall Time
20
ns
tFI
(3)
tCS
tWC
(4)
CS Deselect Time
Write Cycle Time
16
50
ns
10
ms
FN8133.0
March 28, 2005
X55060
Serial Input Timing
tCS
CS
tLEAD
tLAG
SCK
tSU
tH
SI
tRI
tFI
MSB IN
LSB IN
High Impedance
SO
Serial Output Timing
2.7-5.5V
Symbol
Parameter
Min.
Max.
Unit
fSCK
Clock Frequency
10
MHz
tDIS
Output Disable Time
50
ns
Output Valid from Clock Low
40
ns
tV
tHO
0
ns
Output Rise Time
25
ns
(3)
Output Fall Time
25
ns
tRO
tFO
Output Hold Time
(3)
Notes: (3) This parameter is periodically sampled and not 100% tested.
(4) tWC is the time from the rising edge of CS after a valid write sequence has been sent to the end of the self-timed internal nonvolatile
write cycle.
17
FN8133.0
March 28, 2005
X55060
Serial Output Timing
CS
tCYC
tWH
tLAG
SCK
tV
SO
SI
tHO
MSB Out
tWL
MSB–1 Out
tDIS
LSB Out
ADDR
LSB IN
Power-Up and Power-Down Timing
VTRIP1
VBATT
VCC
0V
tPURST
tPURST
tRPD
RESET
VCC
VBAT
VOUT
0V
VOUT
RESET
tVB1
tVB2
VOUT
BATT-ON
18
FN8133.0
March 28, 2005
X55060
VCC to LOWLINE Timings
VTRIP1
VCC
VTRIP
tRPD
tF
0V
VOH
LOWLINE
tRPD
tR
VOL
VTRIP1
VBATT
0V
V2MON to V2FAIL Timings
VTRIP2
V2MON
0V
tRPD2
tRPD2
tF
tR
VOUT
V2FAIL
RESET/RESET/LOWLINE Output Timing
Symbol
tPURST
Parameter
RESET/RESET Time-out Period
PUP = 0
PUP = 1
Min.
Typ.(3)
Max.
Unit
75
500
150
800
250
1200
ms
tRPD(1)
VTRIP1 to RESET/RESET (Power-down only) VTRIP1 to LOWLINE
10
20
µs
tRPD2(1)
VTRIP2 to V2FAIL
10
20
µs
250(4)
800
ns
tLR
LOWLINE to RESET/RESET delay (Power-down only)
100
tF(2)
VCC/V2MON Fall Time
1000
µs
VCC/V2MON Rise Time
1000
µs
tR
(2)
VRVALID
tVB1
tVB2
Notes: (1)
(2)
(3)
(4)
Reset Valid VCC
1
V
VBATT + 0.03 v to BATT-ON (logical 0)
20(4)
µs
VBATT - 0.03 v to BATT-ON (logical 1)
20(4)
µs
This parameter is not 100% tested.
This measurement is from 10% to 90% of the supply voltage.
VCC = 5V at 25°C.
Based on characterization data only.
19
FN8133.0
March 28, 2005
X55060
CS/WDI vs. WDO Timing
CS/WDI
tCST
WDO
tWDO
tWDO
tRST
tRST
RESET/RESET Output Timing
Min.
Typ.(1)
Max.
Unit
Watchdog Time Out Period,
WD1 = 1, WD0 = 0
WD1 = 0, WD0 = 1
WD1 = 0, WD0 = 0
75
200
500
150
400(2)
800(2)
250
600
1200
ms
ms
ms
tCST
CS Pulse Width to Reset the Watchdog
400
tRST
Reset Time Out
75
Symbol
tWDO
Parameter
ns
150
250
ms
Notes: (1) VCC = 5V at 25°C.
(2) Based on characterization data only.
VTRIP Set/Reset Conditions
VTRIPX
VCC/V2MON
tTSU
tTHD
VP
WP
tVPS
tVPH
tPCS
tVPO
CS
8
clocks
tWC
SCK
0n
SI
06h
X = 1, 2
20
02h
* 0001h Set VTRIP1
* 0003h Set VTRIP2
* 000Bh Reset VTRIP1
* 000Dh Reset VTRIP2
* all others reserved
FN8133.0
March 28, 2005
X55060
VTRIP1, VTRIP2 Programming Specifications VCC = 2.7-5.5V; Temperature = 25°C
Parameter
Description
Min. Max.
Unit
tVPS
WP VTRIPX Program Voltage Setup time
10
µs
tVPH
WP VTRIPX Program Voltage Hold time
10
µs
tTSU
VTRIPX Level Setup time
10
µs
tTHD
VTRIPX Level Hold (stable) time
10
ms
tWC
VTRIPX Write Cycle Time
tVPO
WP VTRIPX Program Voltage Off time before next cycle
1
Programming Voltage
10
15
V
VTRIPX Programed Voltage Range
2.5
5.0
V
VTRIPX Program variation after programming (0–75°C). (Programmed at 25°C according to the procedure defined on pages 6, 7 and 8.)
-25
+25
mV
VP
VTRAN
Vtv
10
ms
ms
VTRIPX programming parameters are periodically sampled and are not 100% tested.
21
FN8133.0
March 28, 2005
X55060
PACKAGING INFORMATION
20-Lead Plastic, TSSOP, Package Type V
.025 (.65) BSC
.169 (4.3)
.252 (6.4) BSC
.177 (4.5)
.193 (4.9)
.200 (5.1)
.047 (1.20)
.0075 (.19)
.0118 (.30)
.002 (.05)
.006 (.15)
.010 (.25)
Gage Plane
0° - 8°
Seating Plane
.019 (.50)
.029 (.75)
Detail A (20X)
.031 (.80)
.041 (1.05)
See Detail “A”
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
22
FN8133.0
March 28, 2005
X55060
Part Mark Information
X55060
YYww
W
X
V20 = 20-Lead TSSOP
Date
Code
Part
Mark
VTRIP1
Range
VTRIP2
Range
Operating
Temperature Range
Part Number
Blank
4.5-4.75V
2.55-2.7V
0°C-70°C
X55060V20-4.5A
-40°C-85°C
X55060V20I-4.5A
0°C-70°C
X55060V20-4.5
-40°C-85°C
X55060V20I-4.5
I
AL
4.5-4.75V
2.85-3.0V
AM
F
2.85-3.0V
1.6-1.7V
G
AN
2.55-2.75V
AP
1.6-1.7V
0°C-70°C
X55060V20-2.7A
-40°C-85°C
X55060V20I-2.7A
0°C-70°C
X55060V20-2.7
-40°C-85°C
X55060V20I-2.7
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
23
FN8133.0
March 28, 2005
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