Embedded Controller Chips

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The ThinkPad Embedded Controller

This page contains information about Embedded Controller (also known as slave controller) chips found in ThinkPads.

• Renesas H8

• T20: H8/3437 ; 64F3437TF16 JAPAN (sticker label 08K3766 REV 11)

• Renesas H8S

Apparently H8S microcontrollers have been used on all ThinkPads since the A30, T23, R40, X20.

• T43, T43p, X41 Tablet, Z60t: Renesas H8S/2161BV
• A31, T23, X22: Renesas H8S/2169AV
• T60, T61p, T500, X60: Renesas H8S/2116V
• T510: R4F212 H8S (source)

• Microchip MEC1633

The Microchip MEC1633-series Embedded Controllers can be found in newer ThinkPads, including the following:

• T440p

• Unknown chips with field-upgradeable firmware

Used on older ThinkPads, including the model 570, and maybe even earlier models. IBM called them Slave Controllers.

• Unknown chips with non-field-upgradeable firmware

Used on ancient ThinkPads.

See also

• Embedded controler firmware information and bugs
• BIOS and firmware upgrade information