LM8327
- Internal RC Oscillator, no External Clock Required
- Internal PWM Clock Generation, no External Clock Required
- Programmable I2C-compatible ACCESS.Bus Address (Default 0x8A)
- Support for Keypad Matrices of up to of 8 x 12 Keys, Plus 8 Special Function (SF) Keys, for a Full 104 Key Support
- Support for up to 26 Direct Connect Keys
- I2C-Compatible ACCESS.Bus Slave Interface at 100 kHz (Standard-Mode) and 400 kHz (Fast-Mode)
- Three Host-Programmable PWM Outputs for Smooth LED Brightness Modulation
- Supports General-Purpose I/O Expansion on Pins not Otherwise Used for Keypad or PWM Output
- 15-byte Key Event Buffer
- Multiple Key Event Storage
- Key Events, Errors, and Dedicated Hardware Interrupts Request Host Service by Asserting an IRQ Output
- Automatic HALT Mode for Low Power Operation
- Wake-Up from HALT Mode on any Interface (Rising Edge, Falling Edge or Pulse)
- Three PWM Outputs with Dedicated Script Buffer for up to 32 Commands
- Register-Based Command Interpreter with Auto-Increment Address
Features, Host-Controlled
- PWM Scripting for Three PWM Outputs
- Period of Inactivity that Triggers Entry into HALT Mode
- Debounce Time for Reliable Key Event Polling
- Configuration of General Purpose I/O Ports
- Various Initialization Options (Keypad Size, etc.)
Features, Key Device
- 1.8V ± 10% Single-Supply Operation
- On-Chip Power-On Reset (POR)
- ESD Glitch Filter on RESETN Pin
- Watchdog Timer
- Dedicated Slow Clock Input for 32 kHz up to 8MHz
- −40°C to +85°C Temperature Range
- 36-pin csBGA Package
All trademarks are the property of their respective owners.
The LM8327 GenI/O-Expander and Keypad Controller is a dedicated device to unburden a host processor from scanning a matrix-addressed keypad and to provide flexible and general purpose, host-programmable input/output functions. Three independent PWM timer outputs are provided for dynamic LED brightness modulation.
It communicates with a host processor through an I2C-compatible ACCESS.bus serial interface. It can communicate in Standard (100 kHz) and Fast-Mode (400 kHz) in slave Mode only.
All available input/output pins can alternately be used as a direct key input connection, an input or an output in a keypad matrix, or as a host-programmable general purpose input or output.
Any pin programmed as an input can also sense hardware interrupts. The interrupt polarity (“high-to-low” or “low-to-high” transition) is thereby programmable.
The LM8327 follows a predefined register based set of commands. Upon startup (power on) a configuration file must be sent from the host to setup the hardware of the device.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM8327 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, & ACCESS.bus datasheet (Rev. A) | 2013年 5月 2日 | |
| Application note | Understanding the I2C Bus | PDF | HTML | 2015年 6月 30日 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015年 5月 15日 | ||
| Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015年 2月 13日 |
設計與開發
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TINA-TI — 基於 SPICE 的類比模擬程式
| 封裝 | 引腳 | 下載 |
|---|---|---|
| CS-BGA (NYB) | 36 | 檢視選項 |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。