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參數(shù)資料
| 型號： | MAX5429EUA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC POT DGTL 1TIME PROGR 8-UMAX |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 接片： | 32 |
| 電阻（歐姆）： | 10k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標準值 35 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | I²C（芯片選擇，增/減） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
MAX5427/MAX5428/MAX5429
The value of the counter is then stored and the wiper
position is maintained.
The wiper performs a make-before-break transition,
ensuring that there is never an open circuit during a tran-
sition from one resistor tap to another. When the wiper is
at either end (max/min) of the resistor array, additional
transitions in the direction of the endpoint do not change
the counter value (the counter does not wrap around).
One-Time Programming
The factory-set default position of the wiper on power-
up is tap 16. However, the power-up position can be
changed once using the one-time programming fea-
ture. After the wiper is moved to the desired position,
the programming sequence is initiated by setting U/
D
high, applying 11V to VPP, and then taking CS low. Five
pulses on
CS (consisting of CS starting from low and
going high for tCH and then low for tCL) program the
device (Figure 4). The programming voltage should
then be taken to zero. After the device is programmed,
VPP can be set to zero or be allowed to float. The wiper
position is still adjustable, but always returns to this
programmed position on power-up.
If the intent is to program the device to a specific wiper
position and not to allow further adjustments, then six
programming pulses are required (as opposed to five),
as shown in Figure 4. 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 sup-
ply 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 1).
One-Time Programmable, Linear-Taper
Digital Potentiometers
6
_______________________________________________________________________________________
VDD
U/D
CS
VW
tUP
tCU
tCI
tIL
tIW
tIH
tIC
Figure 2. Increment Mode Serial Interface Timing Diagram
VDD
U/D
CS
VW
tUP
tCU
tCI
tIH
tIW
tIL
tIC
Figure 3. Decrement Mode Serial Interface Timing Diagram
MODE
POWER-ON
RESET WIPER
POSITION
ADJUSTABLE
WIPER
Factory Default
(Unprogrammed)
Tap 16
Yes
Programmed
(5 Programming Pulses)
Programmed
position
Yes
Lock-Bit Set
(6 Programming Pulses)
Programmed
position
No
Table 1. One-Time Programming Options
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