CAT5126ZI-10-G ON Semiconductor, CAT5126ZI-10-G Datasheet - Page 6

• Manufacturer Part Number: CAT5126ZI-10-G
• Description: IC POT DPP OTP 32TAP U/D 8-MSOP
• Manufacturer: ON Semiconductor

Specifications of CAT5126ZI-10-G

• Taps: 32
• Resistance (ohms): 10K
• Number Of Circuits: 1
• Temperature Coefficient: 50 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Resistance In Ohms: 10K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

position and not to allow further adjustments, then six
programming pulses are required (as opposed to five), as
shown in Figure 8. The sixth pulse locks the wiper position
and disables the serial interface. This also allows U/D and
CS to float without any increase in supply current. Once the
lockout bit is set, no further adjustment to the potentiometer
is possible, effectively changing the potentiometer into a
fixed resistor−divider (Table 4).
5. If CAT5126 is Programmed with less than 5 pulses, it does not change the Power−up recall position.
6. During internal power−up the wiper is forced to miscale; thereafter the wiper is set at the stored position.
Table 4. ONE−TIME PROGRAMMING MODE
Factory Default
Programming with 5 pulses at the midscale
position
Programming with 5 pulses different from
midscale position – only once
Programming with 5 pulses if the power up
position was changed before
Programming with 6 pulses if the tap
position is at midscale
Programming ONLY with 6 pulses if the tap
position is different from midscale position
If the intent is to program the device to a specific wiper
V
PP
10 V
U/D
0 V
CS
Mode
Figure 8. One Time Program Mode Serial Interface Timing Diagram
t
PC
t
CH
At midscale
At midscale
At the new programmed
position
At the previous
programmed position
Midscale position forever
At the new programmed
position
Power Up Position
5 BITS PROGRAM WIPER POSITION OPTIONAL LOCKOUT BIT
http://onsemi.com
t
CL
6
(convert to a fixed voltage−divider) or five pulses (program
the initial power−up value of the device, but still be able to
adjust the wiper). If the device is programmed with five
pulses and later it is desired to disable the interface (convert
to a fixed voltage−divider), then care must be taken to ensure
that the wiper is in the same position as it was originally set
to (when programmed with five pulses). The full six
programming pulses must be applied. Note that once the
six−pulse program occurs, no further programming is
possible.
It is recommended that the user either use six CS pulses
Active
Active
Active
Active
I
till power down
I
till power down
2
2
C interface active
C interface active
Interface
Programming allowed
Programming allowed
No further change in power−up
position allowed
None
I
power−up
I
power−up
2
2
C interface disable after next
C interface disable after next
t
CP
Operation
t
PH