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參數(shù)資料
| 型號(hào)： | CAT5251YI-50-T2 |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大小： | 0K |
| 描述： | IC POT DPP 50K 256TAP 24TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 系列： | DPP |
| 接片： | 256 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 300 ppm/°C |
| 存儲(chǔ)器類(lèi)型： | 非易失 |
| 接口： | 6 線(xiàn) SPI（芯片選擇，設(shè)備位址） |
| 電源電壓： | 2.5 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
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CAT5251
http://onsemi.com
3
PIN DESCRIPTIONS
SI: Serial Input
SI is the serial data input pin. This pin is used to input all
opcodes, byte addresses and data to be written to the
CAT5251. Input data is latched on the rising edge of the
serial clock.
SO: Serial Output
SO is the serial data output pin. This pin is used to transfer
data out of the CAT5251. During a read cycle, data is shifted
out on the falling edge of the serial clock.
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to synchronize
the communication between the microcontroller and the
CAT5251. Opcodes, byte addresses or data present on the SI
pin are latched on the rising edge of the SCK. Data on the SO
pin is updated on the falling edge of the SCK.
A0, A1: Device Address Inputs
These inputs set the device address when addressing
multiple devices. A total of four devices can be addressed on
a single bus. A match in the slave address must be made with
the address input in order to initiate communication with the
CAT5251.
RH, RL: Resistor End Points
The four sets of RH and RL pins are equivalent to the
terminal connections on a mechanical potentiometer.
RW: Wiper
The four RW pins are equivalent to the wiper terminal of
a mechanical potentiometer.
CS: Chip Select
CS is the Chip select pin. CS low enables the CAT5251
and CS high disables the CAT5251. CS high takes the SO
output pin to high impedance and forces the devices into a
Standby mode (unless an internal write operation is
underway). The CAT5251 draws ZERO current in the
Standby mode. A high to low transition on CS is required
prior to any sequence being initiated. A low to high
transition on CS after a valid write sequence is what initiates
an internal write cycle.
WP: Write Protect
WP is the Write Protect pin. The Write Protect pin will
allow normal read/write operations when held high. When
WP is tied low, all non-volatile write operations to the Data
registers are inhibited (change of wiper control register is
allowed). WP going low while CS is still low will interrupt
a write to the registers. If the internal write cycle has already
been initiated, WP going low will have no effect on any write
operation.
HOLD: Hold
The HOLD pin is used to pause transmission to the
CAT5251 while in the middle of a serial sequence without
having to re-transmit entire sequence at a later time. To
pause, HOLD must be brought low while SCK is low. The
SO pin is in a high impedance state during the time the part
is paused, and transitions on the SI pins will be ignored. To
resume communication, HOLD is brought high, while SCK
is low. (HOLD should be held high any time this function is
not being used.) HOLD may be tied high directly to VCC or
tied to VCC through a resistor.
Table 1. PIN DESCRIPTION
Pin #
Name
Function
1
SO
Serial Data Output
2
A0
Device Address, LSB
3
RW3
Wiper Terminal for Potentiometer 3
4
RH3
High Reference Terminal for
Potentiometer 3
5
RL3
Low Reference Terminal for
Potentiometer 3
6
NC
No Connect
7
VCC
Supply Voltage
8
RL0
Low Reference Terminal for
Potentiometer 0
9
RH0
High Reference Terminal for
Potentiometer 0
10
RW0
Wiper Terminal for Potentiometer 0
11
CS
Chip Select
12
WP
Write Protection
13
SI
Serial Input
14
A1
Device Address
15
RL1
Low Reference Terminal for
Potentiometer 1
16
RH1
High Reference Terminal for
Potentiometer 1
17
RW1
Wiper Terminal for Potentiometer 1
18
GND
Ground
19
NC
No Connect
20
RW2
Wiper Terminal for Potentiometer 2
21
RH2
High Reference Terminal for
Potentiometer 2
22
RL2
Low Reference Terminal for
Potentiometer 2
23
SCK
Bus Serial Clock
24
HOLD
Hold
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