Lenovo A550-27IMB NM-C971 Schematic
Technical Specifications
Technical Summary
This Asia Vital Components Co., Ltd. A550-27 motherboard, documented under project code CML-SX01, is built around the Intel Comet Lake-S 35W platform with an LGA 1200 socket and a B460 PCH in VFCBGA 885 packaging. The system memory architecture supports two DDR4 SODIMM modules per channel operating at 2666MT/s with a 64-bit data bus. The embedded controller is an ITE 8638E/BX, with an alternate EC_IT8632E/AX package reference. The primary BIOS storage is a 16MB SPI flash ROM at 3.3V, with a reserved 8MB SPI flash ROM option. Audio is handled by an ALC274 High Definition Audio codec. Networking is provided by a Realtek RTL8111H LAN controller and AMP 5825/5720 wireless modules. The HDMI interface uses an RTD2785 level shifter for DP to LVDS bridge functionality. A GL835L controller manages USB hub and SD card reader duties. The TPM module is a SLB9670VQ2.0 running firmware version 7.63. Power management includes an INA300 charging IC and an OZ554 power IC.
Technician FAQ
Q: What BIOS IC models are used on this motherboard?
A: The primary BIOS is a 16MB SPI flash ROM at 3.3V. A reserved 8MB SPI flash ROM at 3.3V is also supported as a compatible option.
Q: Is the EC/KBC programmable on this motherboard?
A: The EC/KBC is an ITE 8638E/BX, with an alternate EC_IT8632E/AX package reference. The schematic does not explicitly indicate ISP or dedicated programming circuitry.
Q: What is the memory architecture of this motherboard?
A: The motherboard supports DDR4 memory with two SODIMM slots per channel, operating at 2666MT/s with a 64-bit data bus.
Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Asia Vital Components Co., Ltd. |
| Model | A550-27 |
| Project Code | CML-SX01 |
| Document Number | A550-27CML-SX01 |
| Date | Monday, March 30, 2020 |
| CPU Platform | Comet Lake-S 35W LGA 1200 Pin Socket |
| PCH / Southbridge | B460 VFCBGA 885 |
| EC / KBC | ITE 8638E/BX |
| EC/KBC Package | EC_IT8632E/AX |
| Audio Codec | ALC274 |
| BIOS / SPI Flash | SPI Flash ROM 16MB*1 @3.3V |
| BIOS Flash Capacity | 16MB |
| Compatible BIOS IC Models | SPI Flash ROM 8MB*1 @3.3V (Reserve only) |
| Charging IC | INA300 |
| Power IC(s) | OZ554 |
| RAM Type | DDR4 |
| RAM Architecture | 2 DIMM/Channel, 2666MT/s, 64 bit |
| RAM Quantity / Slots | 2 SODIMM |
| Card Reader IC | GL835L |
| USB Hub IC | GL835L |
| LAN IC | Realtek RTL8111H |
| WiFi / WLAN IC | AMP 5825 / AMP 5720 |
| HDMI Level Shifter | RTD2785 |
| TPM | SLB9670VQ2.0 FW7.63 |
| SIO | ITE 8638E/BX |
Technical Summary
This Asia Vital Components Co., Ltd. A550-27 motherboard, documented under project code CML-SX01, is built around the Intel Comet Lake-S 35W platform with an LGA 1200 socket and a B460 PCH in VFCBGA 885 packaging. The system memory architecture supports two DDR4 SODIMM modules per channel operating at 2666MT/s with a 64-bit data bus. The embedded controller is an ITE 8638E/BX, with an alternate EC_IT8632E/AX package reference. The primary BIOS storage is a 16MB SPI flash ROM at 3.3V, with a reserved 8MB SPI flash ROM option. Audio is handled by an ALC274 High Definition Audio codec. Networking is provided by a Realtek RTL8111H LAN controller and AMP 5825/5720 wireless modules. The HDMI interface uses an RTD2785 level shifter for DP to LVDS bridge functionality. A GL835L controller manages USB hub and SD card reader duties. The TPM module is a SLB9670VQ2.0 running firmware version 7.63. Power management includes an INA300 charging IC and an OZ554 power IC.
Technician FAQ
Q: What BIOS IC models are used on this motherboard?
A: The primary BIOS is a 16MB SPI flash ROM at 3.3V. A reserved 8MB SPI flash ROM at 3.3V is also supported as a compatible option.
Q: Is the EC/KBC programmable on this motherboard?
A: The EC/KBC is an ITE 8638E/BX, with an alternate EC_IT8632E/AX package reference. The schematic does not explicitly indicate ISP or dedicated programming circuitry.
Q: What is the memory architecture of this motherboard?
A: The motherboard supports DDR4 memory with two SODIMM slots per channel, operating at 2666MT/s with a 64-bit data bus.
Indexed motherboard components
Open a component to see every indexed schematic that uses the same part.
CML-SX01
Project Code
Comet Lake-S
CPU Platform
B460
PCH / Southbridge
8638E/BX
EC / KBC
ALC274
Audio Codec
INA300
Charging / PD IC
OZ554
Power IC
DDR4
RAM Type
GL835L
Card Reader IC
GL835L
USB Controller
RTL8111H
LAN Controller
AMP 5720
WiFi / WLAN
AMP 5825
WiFi / WLAN
RTD2785
Signal Conditioning IC
SLB9670VQ2.0 FW7.63
TPM / Security IC
8638E/BX
Super I/O
Indexed motherboard components
Open a component to see every indexed schematic that uses the same part.
CML-SX01
Project Code
Comet Lake-S
CPU Platform
B460
PCH / Southbridge
8638E/BX
EC / KBC
ALC274
Audio Codec
INA300
Charging / PD IC
OZ554
Power IC
DDR4
RAM Type
GL835L
Card Reader IC
GL835L
USB Controller
RTL8111H
LAN Controller
AMP 5720
WiFi / WLAN
AMP 5825
WiFi / WLAN
RTD2785
Signal Conditioning IC
SLB9670VQ2.0 FW7.63
TPM / Security IC
8638E/BX
Super I/O
Attachments
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