LCC USB SSD (DUL)

Info Box Applies to DUL

Please note that information here provided are preliminary and subject to change.

Introduction

DUL belongs to the Dave Solid State Disk (SSD) product family. These devices implements SSD solutions that are conceived for use in embedded systems operating in harsh environments where no compromises are tolerated about relibility. On the other hand, they are designed in order to ease the use from the system integrator's standpoint, in terms of hardware issues and software compatibility. These characteritcs make them suited for use in combination with a wide range of host devices, from low-cost microcontrollers to high-end embedded processors.

SSD product family is composed by several subfamilies. Two major factors distinguish subfamilies: mechanical outline and host interface. DUL comes in Leadless Chip Carrier (LCC) package. Host interface is USB. Non-volatile storage is based on NAND flash tecnology.

Reliability

This section highlights product characteristics and features that have been adopted at design stage in order to push intrinsic reliability to the maximum possible extent.

• From the mechanical standpoint, adoption of LCC outline guarantees a solid and firm mating with carrier board hosting DUL making this product particularly suited for environments where mechanical vibrations are an issue.
• About power supply, two inputs are provided along with status indicators:
  • VIN: this is main power supply input. See Pinout section for more information about voltage range.
  • VIN_AUX (available on request): this input is provided to implement a second power supply unit on carrier board (for example based on supercap or battery) that prevents power cut in case main supply experiences a glitch or a power cut. This option is a powerful weapon to face unpredictable power loss and to guarantee data integrity.
  • Power rail switch indicator.
  • Overcurrent/thermal warning indicator.
• NAND flash: by default NAND technology is SLC. MLC memories are available on request.
• read-only modes: two signals are provided in order to inhibit any write operation on NAND flash. See Read-only modes and Pinout section for more details.
• NAND controller: the controller implements specific algorithms designed
  • to prevent data corruption in case of power failure
  • to recover from unexpected power-off

Specification

• Package outline: Leadless Chip Carrier aka LCC-68 (JEDEC MS004), 9 actual leads per side
• Operating temperature range: -40/+85°C

Pinout

Actual pin number	LCC-68 pin number	Name	Type	Description	Voltage	Note
1	5	VIN	Power	Main power supply input	2.0 – 5.5V
2	6	VIN	Power	Main power supply input	2.0 – 5.5V
3	7	VIN_AUX	Power	Backup power supply input (available on request)	1.8 – 5.5V	If not available, please leave unconnected.
4	8	VIN_AUX	Power	Backup power supply input (available on request)	1.8 – 5.5V	If not available, please leave unconnected.
5	9	GND		Ground
6	10	GND		Ground
7	11	NC		Reserved fo future use	-	Please leave unconnected.
8	12	NC		Reserved fo future use	-	Please leave unconnected.
9	13	NC		Reserved fo future use	-	Please leave unconnected.
10	22	STAT2#	Open-drain output	Status indicator for backup power supply. Pulls down when power is drawn from VIN_AUX rail.		Can be left open or grounded when not used.
11	23	WARN#	Open-drain output	Overcurrent/thermal warning indicator. Pulls down when either main power supply or backup power supply current exceeds its current limit (4A) or die temperature of internal switch (130°C) is close to thermal shutdown.
12	24	STAT1#	Open-drain output	Status indicator for main power supply. Pulls down when power is drawn from VIN_AUX rail.		Can be left open or grounded when not used.
13	25	NC		Reserved fo future use	-	Please leave unconnected.
14	26	NC		Reserved fo future use	-	Please leave unconnected.
15	27	NC		Reserved fo future use	-	Please leave unconnected.
16	28	NC		Reserved fo future use	-	Please leave unconnected.
17	29	NC		Reserved fo future use	-	Please leave unconnected.
18	30	NC		Reserved fo future use	-	Please leave unconnected.
19	39	GND		Ground
20	40	GND		Ground
21	41	D+	Differential	USB data port (positive)
22	42	D-	Differential
23	43	GND		Ground
24	44	NC		Reserved fo future use	-	Please leave unconnected.
25	45	NC		Reserved fo future use	-	Please leave unconnected.
26	46	GND		Ground
27	47	GND		Ground
28	56	NC		Reserved fo future use	-	Please leave unconnected.
29	57	NC		Reserved fo future use	-	Please leave unconnected.
30	58	NC		Reserved fo future use	-	Please leave unconnected.
31	59	LCC_RESET#	Bidirectional	NAND flash controller reset	3.3V	Internally connected to 100kOhm pull-up and 10nF capacitor to ground. Can be used to force controller reset by external cicruitry.
32	60	SET_WP#	Input	NAND flash controller write protect (active low). When active, write operations are inhibited at controller level.	3.3V	Can be used to implement write protect mechanism like the switch of consumer USB pen drive.
33	61	LED_0	Output	Ready/working indicator.	3.3V	Used to drive a LED to implement visual indicator.
34	62	NC		Reserved fo future use	-	Please leave unconnected.
35	63	NC		Reserved fo future use	-	Please leave unconnected.
36	64	EXT_FWP#	Output/Bidirectional	NAND flash write protect.

Integration guide

This sectoin provides useful information and resources that allow the system designer to integrate DUL module in his/her application very quickly.

Backup power supply circuits

Please refer to Backup power supply circuits (SSD modules).

PCB footprint