NXP Semiconductors SDIO101AIHRZ

Overview

SDIO101AIHRZ from NXP Semiconductors is a single-slot SD/SDIO/MMC/CE-ATA host controller IC with 16-bit asynchronous memory interface, supporting full-speed (<25 MHz) and high-speed (<52 MHz) data transfers, 1.8 V core supply, and 1.8–3.3 V SD port voltage range. It enables embedded microprocessor systems to interface with SD cards, Wi-Fi/BT SDIO modules, eMMC storage, and CE-ATA peripherals.

For engineers reviewing the SDIO101AIHRZ datasheet, SDIO101AIHRZ pinout, SDIO101AIHRZ application, or SDIO101AIHRZ equivalent, key selection considerations include its HXQFN60 package, dual-voltage domain support (VDD=1.8 V, VDD(IO)=2.5–3.3 V), built-in 2 kB double-buffer, fractional clock divider for precise SDCLK tuning, and five-level power management including Hibernate and Coma modes.

Technical Context

The SDIO101AIHRZ implements the SD Host Controller Standard Specification v2.0 register set with four additional proprietary registers for enhanced control. Its on-chip PLL accepts X1_CLK input (e.g., 13 MHz system clock) and generates up to 104 MHz internal frequency, which is then divided via integer + fractional dividers to achieve exact SDCLK targets (e.g., 48.9 MHz).

It supports slave-DMA mode using DREQ signaling with programmable burst size (1–511 × 16-bit words) and inter-delay (in SD clock cycles), while interrupt-driven operation uses standard 256-byte host register space mapped at CS/A[7:1]/D[15:0]. Buffer access under DMA requires A8=HIGH and alternates between Buffer Data Port 0 (0x20) and Port 1 (0x22).

Key Specifications

Pinout & Package

HXQFN60 package: 5 mm × 5 mm × 0.5 mm, 60-terminal thermal-enhanced quad flat no-lead with exposed center pad (GND). Requires PCB thermal vias and soldered thermal pad for reliable operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SD/SDIO/MMC host controller applications.

Compared with AS3722-SDIO and TI OMAP-L138, SDIO101AIHRZ offers unmatched configurability in clock generation, independent voltage domain control, and hardware card-detection features - making it the optimal choice for discrete, multi-vendor, or legacy-processor-based SDIO integration where timing precision and power granularity matter.

Availability

SDIO101AIHRZ is available at Aetrix Electronics and suitable for mobile handset storage expansion, industrial IoT gateways, medical diagnostic handhelds, automotive infotainment SD card slots, and embedded edge computing applications requiring stable component supply across extended temperature ranges.

Supply support for SDIO101AIHRZ 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The SDIO101AIHRZ belongs to NXP's interface and connectivity controller product line, designed specifically to enable robust, low-power, standards-compliant SD/SDIO/MMC/CE-ATA host functionality in resource-constrained embedded systems.

FAQ

What is the primary function of the SDIO101AIHRZ in an embedded system?

The SDIO101AIHRZ serves as a standards-compliant SD/SDIO/MMC/CE-ATA host controller IC that bridges a microprocessor's 16-bit memory interface to removable storage or peripheral cards. It handles physical-layer protocol timing, command/response sequencing, CRC generation, clock distribution, and power control - enabling plug-and-play integration of SD cards, Wi-Fi modules, and eMMC devices without requiring custom PHY design. SDIO101AIHRZ implements the full SD Host Controller Standard v2.0 register set plus proprietary enhancements for clock and power optimization.

Does the SDIO101AIHRZ support both SD and MMC protocols simultaneously?

Yes, the SDIO101AIHRZ supports SD, SDIO, MMC, and CE-ATA protocols within a single slot, but not concurrently in the same transaction. It dynamically adapts to the connected device type during initialization: SD/SDIO cards use 1-bit or 4-bit mode; MMC/CE-ATA devices use 8-bit mode. The controller automatically detects card type via CMD0/CMD1 handshaking and configures the appropriate data bus width, timing parameters, and command set - all managed transparently by compliant host driver software.

How does the fractional clock divider in the SDIO101AIHRZ improve system design flexibility?

The fractional clock divider (accessed via Secondary Clock Control register 0xF6) allows precise SDCLK synthesis - for example, deriving 48.9 MHz from a 13 MHz system clock - eliminating the need for a dedicated SD-specific crystal. This reduces BOM cost, board area, and EMI sources. Unlike integer-only dividers, the M/16 fractional term enables sub-percent frequency accuracy, ensuring compliance with SD timing margins while maximizing throughput. SDIO101AIHRZ thus supports clock tree consolidation in SoC-centric designs.

What are the power-saving capabilities of the SDIO101AIHRZ, and how are they controlled?

The SDIO101AIHRZ provides five hierarchical power modes: Active, Standby, Sleep, Coma, and Hibernate. Coma mode gates internal power to most logic blocks; Hibernate disables the oscillator, PLL, and buffer memories - reducing current to <1 µA. These modes are controlled via the Miscellaneous register (0xF8) and Clock Control register (0x2C), allowing software to dynamically trade off latency versus power. Critical features like SDCD and SDWP remain functional in Sleep mode, enabling wake-on-insertion without full reinitialization.

Can the SDIO101AIHRZ be used with modern Linux SDHCI drivers without modification?

Yes, the SDIO101AIHRZ implements the complete SD Host Controller Standard v2.0 register map (offsets 0x00–0x3F, 0x40–0x4F) and is fully compatible with standard Linux SDHCI driver stacks. Its register behavior - including Present State, Power Control, and Capabilities fields - matches specification expectations. Proprietary registers (0x50, 0xF4–0xFA) reside outside the standard space and are ignored by generic drivers, enabling out-of-box support. Driver enhancements may leverage extra features (e.g., fractional clock control), but basic SD/SDIO/MMC functionality works immediately.