Infineon Technologies SLB9670VQ20FW785XTMA1

Overview

SLB9670VQ20FW785XTMA1 from Infineon is a TPM 2.0 Trusted Platform Module implementing TCG family 2.0 specifications, featuring SPI interface (up to 43 MHz), FIPS 140-2 Level 2 validation (Certificate #3492), and hardware-based secure key generation. It delivers 24 PCRs (SHA-1/SHA-256), ≥6962 bytes free NV memory, and operates across -20°C to +85°C in battery-constrained platforms like Chromebooks and Windows laptops.

For engineers reviewing the SLB9670VQ20FW785XTMA1 datasheet, SLB9670VQ20FW785XTMA1 pinout, SLB9670VQ20FW785XTMA1 application, or SLB9670VQ20FW785XTMA1 equivalent, this page provides verified technical context on TPM2.0 compliance, SPI timing constraints, low-power wake behavior, and pin-level GPIO/PP signal handling per TCG specification alignment.

Technical Context

The SLB9670VQ20FW785XTMA1 implements a dedicated hardware root of trust with internal power management that automatically enters low-power state after each SPI command/response transaction and wakes instantly upon host-initiated SCLK activity. It supports only SPI Mode 0 with strict timing requirements: tSU(CS) = 10 ns min, tH(CS) = 10 ns min, and tSU(DO) = 5 ns min.

It integrates NIST SP800-90A-compliant RNG, full EK personalization, and firmware validated for Intel TXT, Microsoft Windows, and Google Chromebook platform certification. Its 1420-byte I/O buffer and 768-byte NV read/write limit define real-time command throughput boundaries in embedded OS environments.

Key Specifications

Pinout & Package

SLB9670VQ20FW785XTMA1 uses PG-VQFN-32-13 package (5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad). Pin layout follows TCG-compliant VQFN mapping with dedicated SPI, reset, interrupt, and optional PP/GPIO signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM 2.0 security module applications.

Compared with SLB9670XQ20FW785XTMA1, the VQ variant trades extended temperature tolerance for cost optimization in consumer-grade platforms; compared with SLB9673VQ20FW785XTMA1, it offers simpler SPI-only integration at lower BOM cost and reduced firmware driver complexity.

Availability

SLB9670VQ20FW785XTMA1 is available at Aetrix Electronics and suitable for laptop security modules, industrial edge gateways, Chromebook identity systems, and medical device data integrity solutions requiring stable component supply and long-term lifecycle assurance.

Supply support for SLB9670VQ20FW785XTMA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, security, and sensing solutions for automotive, industrial, and IoT markets.

SLB9670VQ20FW785XTMA1 belongs to the OPTIGA™ TPM product line, designed specifically to deliver certified, hardware-rooted trust for endpoint platforms requiring FIPS-validated cryptographic services and TCG-compliant attestation.

FAQ

Is SLB9670VQ20FW785XTMA1 compatible with Linux kernel tpm_tis_spi driver?

Yes. The device implements standard TPM 2.0 SPI protocol compliant with TCG PC Client Platform TPM Profile (PTP) Specification v1.05. It supports SPI Mode 0 with tSU(CS) ≥10 ns and tH(CS) ≥10 ns, matching kernel driver timing assumptions. Verified operation confirmed with Linux 5.10+ kernels using default tpm_tis_spi probe parameters and no custom timing overrides.

Does SLB9670VQ20FW785XTMA1 require external pull-up resistors on PIRQ# or RST#?

PIRQ# requires an external pull-up resistor (typically 4.7 kΩ) because it is open-drain with no internal pull-up. RST# has a weak internal pull-up resistor (≈50 kΩ), but a stronger external pull-up (≤10 kΩ) is recommended for robust noise immunity in high-speed motherboard environments per Infineon's design guidelines in Section 3.1 of the datasheet.

What is the maximum sustained SPI clock frequency supported in production use?

The device supports up to 43 MHz SPI clock frequency under all specified operating conditions (VDD = 3.3 V ±5%, TA = -20°C to +85°C). This value is validated across process corners and voltage extremes, not just typical conditions. Operation above 43 MHz risks setup/hold violations on MISO due to fixed internal propagation delays documented in Table 13 (AC Characteristics).

Can GPIO and PP pins be used for custom firmware functionality?

No. GPIO (Pin 6) and PP (Pin 7) are reserved per TCG TPM 2.0 specification and have no firmware-accessible function in SLB9670VQ20FW785XTMA1. GPIO is internally disconnected in TPM2.0 mode and may float; PP is pulldown-biased but unused. Neither pin supports user-programmable I/O or interrupt generation - their roles are strictly defined for future TCG extensions.