---
title: Introduction to DIO1568 Analog Switch
description: "## Basic Overview The DIO1568 Evaluation Board (EVB) provides an easy and efficient way to test and develop prototypes using the DIO1568, a low-power quad SPDT analog switch specifically designed for dual-SIM card switching applications. Operating from a wide supply…"
url: "https://eicut.com/wiki/development-boards/introduction-to-dio1568-analog-switch/"
updated: "2026-02-15"
category: Development Boards
---

# Introduction to DIO1568 Analog Switch

## Basic Overview

The DIO1568 Evaluation Board (EVB) provides an easy and efficient way to test and develop prototypes using the DIO1568, a low-power quad SPDT analog switch specifically designed for dual-SIM card switching applications. Operating from a wide supply voltage range of 1.65 V to 5.5 V, this device features extremely low on-resistance of just 0.85 Ω across the SIM signal paths and ensures reliable break-before-make switching performance thanks to advanced sub-micron CMOS technology. It also draws minimal quiescent current even when the control logic voltage is lower than VCC, allowing direct connection to baseband processor GPIO pins in smartphones and other portable devices. The DIO1568 is offered in two small-footprint QFN packages: 1.8 × 2.6 mm (16-pin) and 3 × 3 mm (16-pin).

## Feature List

- **Switch type:** Quad SPDT (4×)
- **Supply voltage:** 1.65 V to 5.5 V
- **Low on-resistance:** 0.85 Ω (SIM path); 2.7 Ω (other paths)
- **Capacitance:** 20 pF CON at DAT/CLK/RST path
- **Low quiescent power consumption** (suitable for battery-powered devices)
- **Package options:** 16‑lead QFN 1.8×2.6 mm and 16‑lead QFN 3×3 mm

## Board Resources

### Function Description

The detailed assignment of the peripheral interfaces on the Development board is as follows:

 

![Dual-view diagram of DIO1568 Analog Switch](https://eicut.com/wp-content/uploads/2025/10/switch-simcard-Components_des-2048x1016-1-1024x508.webp)
**Eicut DIO1568 Analog Switch Pinout & Connectors**

| NO. | Name | Silkscreen | Comment |
| --- | --- | --- | --- |
| **1** | 4pin header | P3 | header 2.54mm |
| **2** | 6pin header | P2 | header 2.54mm |
| **3** | Dual Sim card case | - | 2FF SIM Card |
| **4** | FPC Connector | P1 | FPC 6pin |

### Board Interfaces

 

 

![Annotated top view of DIO1568 Switch Board](https://eicut.com/wp-content/uploads/2025/10/switch-simcard-Mini-DBpinout-1024x641.webp)
**Pin Header Pinout**

 

| NO. | Name | Silkscreen | Comment |
| --- | --- | --- | --- |
| **P3-1** | Ground | GND | - |
| **P3-2** | Select | Sel | 0 - Power |
| **P3-3** | Power | VCC | 1.65~4.3V |
| **P3-4** | Ground | GND | - |
| **P2-1** | VSIM | VSIM | These pins are similar to the pins of the FPC connector. You can use them if you do not use the FPC connector. |
| **P2-2** | VCC | VCC |  |
| **P2-3** | RST | RST |  |
| **P2-4** | CLK | CLK |  |
| **P2-5** | DATA | DATA |  |
| **P2-6** | Simcard-GND | SIMG |  |

For switching between two SIM cards, you can connect the Select pin (pin header P3) to ground or VCC manually with a jumper, or you can control this pin using a microcontroller to set it high or low.

## Board Dimensions

![Dimensioned drawing of DIO1568 Analog Switch](https://eicut.com/wp-content/uploads/2025/10/switch-simcard-size-1024x734.webp)
**DIO1568 Analog Switch Dimensions : 30 * 40 mm**

 

## Getting Started Preparation

Step 1: Connect the board power

Step 2: Place the SIM cards in the SIM card case

Step 3: Switch between SIM cards by High and Low the select pin

Step 4: Connect the board to your microcontroller with the FPC connector or the header pin(P2)

## Resources Downloads

- [switch simcard DB schematic](https://eicut.com/wp-content/uploads/2025/10/switch-simcard-schematic.pdf)
- [ DIO1568 Analog Switch Datasheet](https://eicut.com/wp-content/uploads/2025/10/DIO1568.pdf)

## FAQ

    What is the DIO1568 EVB?

A ready-to-use development board for the **DIO1568** — an ultra-low Ron (0.85 Ω) quad SPDT analog switch designed specifically for **dual-SIM / DSDS** smartphones and IoT devices.

    How do I switch between SIM 1 and SIM 2?

Just control the **SEL pin** (P3-2):
 • **Logic HIGH** → SIM 2 active
 • **Logic LOW** → SIM 1 active
 You can use a jumper or directly drive it from any MCU GPIO.

    What voltage can I use to power the board?

Wide range: **1.65 V to 5.5 V** on VCC pin (P3-3). Most users connect **1.8 V or 3.0 V** directly from the baseband processor or PMIC.

    Does it support 2FF (standard) SIM cards?

Yes — two full-size **2FF (mini-SIM)** push-push card holders are integrated on the board. Perfect for quick testing without soldering.

    How do I connect the board to my phone motherboard?

Two options:
 • Use the onboard **6-pin FPC connector** (standard 0.5 mm pitch)
 • Or solder wires to the **P2 header** (VSIM, RST, CLK, DATA, VCC, GND)

    Is break-before-make switching guaranteed?

Yes — the DIO1568 has built-in **break-before-make** timing to prevent shorting between the two SIM cards during switching.

    How low is the power consumption?

Extremely low — **<1 µA** quiescent current even when control voltage is lower than VCC. Ideal for always-on dual-SIM phones.

    Can I drive the SEL pin directly from a 1.8 V GPIO?

Yes — the control input threshold is independent of VCC. You can safely connect **1.8 V baseband GPIO** even if VCC is 3.0 V.

    Is the board suitable for final product integration?

Absolutely — use the provided **layout and schematic** as reference. The chip comes in tiny **1.8×2.6 mm QFN** — perfect for space-constrained designs.

    Does it affect SIM card signal quality?

No — only **0.85 Ω Ron** and **20 pF** capacitance on DAT/CLK/RST lines ensure minimal impact on rise/fall times and eye diagram.

[![DIO1568 Dual Sim Analog Switch for 2FF USIM, FPC Cable support](https://eicut.com/wp-content/uploads/2025/11/Frame-21_11zon-931x1024.webp)](https://eicut.com/product/dio1568-dual-sim-analog-switch/)