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| 型號： | MCP4242T-502E/UN |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 55/88頁 |
| 文件大小： | 0K |
| 描述： | IC RHEOSTAT 5K 2CH 10MSOP |
| 標準包裝： | 2,500 |
| 系列： | WiperLock™ |
| 接片： | 129 |
| 電阻（歐姆）： | 5k |
| 電路數(shù)： | 2 |
| 溫度系數(shù)： | 標準值 150 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | 4 線 SPI（芯片選擇） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MCP4242T-502-E/UN MCP4242T-502-E/UNTR MCP4242T-502-E/UNTR-ND MCP4242T-502E/UNTR |
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2008 Microchip Technology Inc.
DS22059B-page 59
MCP414X/416X/424X/426X
8.0
APPLICATIONS EXAMPLES
Non-volatile digital potentiometers have a multitude of
practical uses in modern electronic circuits. The most
popular uses include precision calibration of set point
thresholds, sensor trimming, LCD bias trimming, audio
attenuation, adjustable power supplies, motor control
overcurrent trip setting, adjustable gain amplifiers and
offset
trimming.
The
MCP414X/416X/424X/426X
devices can be used to replace the common mechani-
cal trim pot in applications where the operating and
terminal voltages are within CMOS process limitations
(VDD = 2.7V to 5.5V).
8.1
Split Rail Applications
All inputs that would be used to interface to a Host
Controller support High Voltage on their input pin. This
allows the MCP4XXX device to be used in split power
rail applications.
An example of this is a battery application where the
PIC MCU is directly powered by the battery supply
(4.8V) and the MCP4XXX device is powered by the
3.3V regulated voltage.
For SPI applications, these inputs are:
CS
SCK
SDI (or SDI/SDO)
WP
SHDN
Figure 8-1 through Figure 8-2 show three example split
rail systems. In this system, the MCP4XXX interface
input signals need to be able to support the PIC MCU
output high voltage (VOH).
In Example #1 (Figure 8-1), the MCP4XXX interface
input signals need to be able to support the PIC MCU
output high voltage (VOH). If the split rail voltage delta
becomes too large, then the customer may be required
to do some level shifting due to MCP4XXX VOH levels
related to Host Controller VIH levels.
In Example #2 (Figure 8-2), the MCP4XXX interface
input signals need to be able to support the lower
voltage of the PIC MCU output high voltage level (VOH).
Table 8-1 shows an example PIC microcontroller I/O
voltage specifications and the MCP4XXX specifica-
tions. So this PIC MCU operating at 3.3V will drive a
VOH at 2.64V, and for the MCP4XXX operating at 5.5V,
the VIH is 2.47V. Therefore, the interface signals meet
specifications.
FIGURE 8-1:
Example Split Rail
System 1.
FIGURE 8-2:
Example Split Rail
System 2.
TABLE 8-1:
VOH - VIH COMPARISONS
PIC (1)
MCP4XXX (2)
Comment
VDD
VIH
VOH VDD
VIH
VOH
5.5
4.4
2.7
1.215 — (3)
5.0
4.0
3.0
1.35
— (3)
4.5
3.6
3.3
1.485 — (3)
3.3
2.64 2.64 4.5
2.025 — (3)
3.0
2.4
5.0
2.25
— (3)
2.7
2.16 2.16 5.5
2.475 — (3)
Note 1:
VOH minimum = 0.8 * VDD;
VOL maximum = 0.6V
VIH minimum = 0.8 * VDD;
VIL maximum = 0.2 * VDD;
2:
VOH minimum (SDA only) =;
VOL maximum = 0.2 * VDD
VIH minimum = 0.45 * VDD;
VIL maximum = 0.2 * VDD
3:
The only MCP4XXX output pin is SDO,
which is Open-Drain (or Open-Drain with
Internal Pull-up) with High Voltage Support
Voltage
Regulator
5V
3V
PIC MCU
MCP4XXX
SDI
CS
SCK
WP
SHDN
SDI
CS
SCK
WP
SHDN
SDO
Voltage
Regulator
3V
5V
PIC MCU
MCP4XXX
SDI
CS
SCK
WP
SHDN
SDI
CS
SCK
WP
SHDN
SDO
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