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来自维基百科，自由的百科全书
MI熱靴（Multi Interface Shoe）是索尼公司於2012年9月推出的一種熱靴接口，物理上基於ISO518規範[1]，可以觸發兼容閃光燈，但同時通過前端附帶的金手指提供額外功能，除了配合原廠燈實現TTL功能外，還可以支持麥克風、GPS等與相機交換信息。
MI熱靴用於替代索尼之前繼承美能達單反系統而獲得的i-ISO熱靴，為標準冷靴附件，與單點熱靴產品提供更好的支持。索尼公司在之後推出的相機與攝像機產品上以此來作為熱靴標準配置。
索尼在2005年接收柯尼卡美能達公司相機事業部門，沿用其機型於1988年開始配置使用的iISO熱靴。因為物理上與ISO518熱靴不兼容，對於通用性附件支持不好，及希望增加新的功能，索尼公司於2012年9月隨α99一同，發佈了新款的MI熱靴（Multi Interface）接口[2]，字面為「多接口熱靴」。
| Pin | Direction (Shoe) | Type | Signal | AAS | SAT | Comment |
|---|---|---|---|---|---|---|
| 1 | Generic | ID3 | N/A | N/A | Hotshoe type identification (left-most pin, except for pin 23) | |
| 2 | Generic | ID2 | N/A | N/A | Hotshoe type identification | |
| 3 | Generic | ID1 | N/A | N/A | Hotshoe type identification | |
| 4 | 麥克風 或 EVF電子取景器 | MIC_GND | N/A | MIC_GND | Microphone ground (analog) | |
| 5 | 麥克風 或 EVF電子取景器 | MIC_L / GVIF_SDATA_N | N/A | MIC_L / (GVIF_SDATA_N) | Left Microphone (analog), EVF | |
| 6 | 麥克風 或 EVF電子取景器 | MIC_R / GVIF_SDATA_P | N/A | MIC_R / (GVIF_SDATA_P) | Right Microphone (analog), EVF | |
| 7 | Supply (Out) | Power | REG_GND | GND | REG_GND | Logic ground - connected to pin 15, 23, 24 in camera |
| 8 | GPS 或 WLAN | GPS_PWR_CTRL / WLAN_SD_CLK | N/A | N/A | ||
| 9 | GPS 或 WLAN | GPS_CTS / WLAN_SD_D0 | N/A | N/A | ||
| 10 | GPS 或 WLAN | GPS_RTS / WLAN_SD_D1 | N/A | N/A | ||
| 11 | GPS or WLAN | GPS_UART_TXD / WLAN_SD_D2 | N/A | N/A | ||
| 12 | GPS or WLAN | GPS_UART_RXD / WLAN_SD_D3 | N/A | N/A | ||
| 13 | Supply (Out) | Power | LOGIC_VDD | LOGIC_VDD | Switched, regulated low power 3.15V supply | |
| 14 | Microphone or WLAN or Audio | MIC_C / WLAN_SD_CMD / SP_OUT / AUDIO_L | N/A | MIC_C | ||
| 15 | Supply (Out) | Power | REG_GND | GND | REG_GND | Logic ground - connected to pin 7, 23, 24 in camera |
| 16 | GPS or WLAN or Audio | XGPS_RST / XWLAN_RST / AUDIO_R | N/A | N/A | ||
| 17 | Supply (Out) | Power | UNREG | UNREG | Switched, fused (1.6 A), unregulated battery power (battery plus, 6.1-8.4V) against pin 21 | |
| 18 | Out | Flash or EVF | F3 / EXT_EVF_SCK | F3 | F3 / (EXT_EVF_SCK) | |
| 19 | In | 閃光燈或EVF電子取景器 | F2 / EXT_EVF_SI | F2 | F2 / (EXT_EVF_SI) | |
| 20 | Out | 閃光燈或EVF電子取景器 | F1# / EXT_EVF_SO | N/A | F1# / (EXT_EVF_SO) | |
| 21 | Supply (Out) | Power | PGND | PGND | Power ground (battery minus) / on-camera detection (right-most pin, except for pin 24) | |
| 22 | Open Collector/Drain (Out) | Flash | ISO_SHOE_X | F1 | N/A | ISO shoe X sync (middle contact) - for low voltage trigger circuits only |
| 23 | Power / Supply | Flash | ISO_SHOE_FG | GND | ISO shoe frame ground (left) - connected to pin 24, 7, 15 in camera | |
| 24 | Power / Supply | Flash | ISO_SHOE_FG | GND | ISO shoe frame ground (right) - connected to pin 23, 7, 15 in camera |
適用於iISO附件與MI熱靴新相機適配
適用於MI熱靴新款附件與iISO相機適配
用於離機線纜連接用
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