東芝電子元件及儲存裝置株式會社(東芝)推出通用系統電源積體電路(IC) TB9045FNG,該產品支援多路電源輸出及汽車應用的功能安全[1]。新推出的IC提供四個版本,輸出電壓範圍在1.1V到1.5V之間。量產定於本月啟動。
電動輔助轉向盤(EPS)和自動煞車系統等汽車安全控制組件,須滿足ISO 26262功能安全標準中規定的最高車輛安全完整性等級ASIL-D [2]。
新款IC內建各種診斷功能,例如過高低電壓、過高熱及內部振盪器頻率異常等等,也能監視外部MCU的Watchdog timer(監視計時器)電路並判斷整體系統的異常狀態。這款IC還能自行檢查IC內部之硬體電路且診斷電路中的潛在故障,以確保更高的功能安全。
東芝亦能從外部電腦注入虛擬的異常狀態並模擬系統故障,將為客戶提供功能安全FMEDA [3]等文件服務,以支援硬體/軟體/文件之三個面向的安全設計。
檢查IC內部之硬體電路且診斷電路中的潛在故障,以確保更高的功能安全
客戶能以兩種SPI [5]通訊輸入方式將診斷結果對外回報。第一種方式為將重設信號的輸出;
第二種方式為向系統通知異常操作,使用者可選適合方式。
Part number |
|
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Output voltage |
400mA current capacitance (single circuit): 5.0V±0.1V (typ.) 100mA current capacitance (3 circuits): 5.0V ±20mV (typ.) 800mA current capacitance (single circuit): TB9045FNG-110: 1.1V (typ.) TB9045FNG-120: 1.2V (typ.) TB9045FNG-125: 1.25V (typ.) TB9045FNG-150: 1.5V (typ.) |
Output current capacitance |
400mA (single circuit), 100mA (3 circuits), 800mA (single circuit) |
Operation voltage range |
2.7 to 18V |
Failure detections |
Low-voltage detection circuit for the battery power supply High-voltage detection circuit for the DC-DC converter (6V) High-voltage / Low-voltage detection circuits for series power supply (5V) Over heat detection Oscillation frequency monitoring circuit Watchdog timer circuit for the external MCU |
Power on reset |
Power on reset time is adjustable by the external capacitor |
Watchdog timer |
Window control: Time is configured independently in high-speed detection and low-speed detection. |
Watchdog control |
Operation or stop mode is switched by the watchdog timer select pin (WS pin). |
Operating temperature range |
-40 to 125℃ |
Package |
HTSSOP48-P-300-0.50(6.1mm×12.5mm×1.0mm) |
Mass production |
Scheduled for December 2019 (1 million pcs/year) |