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參數(shù)資料
| 型號(hào)： | DS4550E+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 16/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 9B 20TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 接口： | I²C，JTAG |
| 輸入/輸出數(shù)： | 9 |
| 中斷輸出： | 無(wú) |
| 頻率 - 時(shí)鐘： | 400kHz |
| 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： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
| 包括： | EEPROM |
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DS4550
I2C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
_____________________________________________________________________
7
I2C
INTERFACE
VCC
SDA
SCL
A0
A1
A2
TMS
TDI
TDO
TCK
GND
DS4550
BSC
EEPROM
64 BYTES
USER
MEMORY
I/O CONTROL
REGISTERS
PULLUP ENABLE (F0h-F1h)
I/O CONTROL (F2h-F3h)
I/O STATUS (F8h-F9h)
BOUNDARY SCAN CELL (BSC)
JTAG
CONTROL
PORT
VCC
I/O CELL
(x9)
RPU
I/O_n
[n = 0 TO 8]
VCC
RJPU
BSC
Block Diagram
Detailed Description
The DS4550 contains nine bidirectional, NV, input/out-
put (I/O) pins, and a 64-byte EEPROM user memory.
The I/O pins and user memory are accessible through
either the I2C compatible serial bus or the IEEE 1149.1
JTAG interface.
Programmable NV I/O Pins
Each programmable I/O pin consists of an input and an
open-collector output with a selectable internal pullup
resistor. To enable the pullups for each I/O pin, write to
the Pullup Enable Registers (F0h and F1h). To pull the
output low or place the pulldown transistor into a high-
impedance state, write to the I/O Control Registers (F2h
and F3h). To read the voltage levels present on the I/O
pins, read the I/O Status Registers (F8h and F9h). To
determine the status of the output register, read the I/O
Control Registers and the Pullup Resistor Registers.
The I/O Control Registers and the Pullup Enable
Registers are all SRAM-shadowed EEPROM registers.
It is possible to disable the EEPROM writes of the regis-
ters using the SEE bit in the Configuration Register.
This reduces the time required to write to the register
and increases the amount of times the I/O pins can be
adjusted before the EEPROM is worn out.
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