6. Smart Star Specifications

This chapter provides the specifications for the Smart Star backplane and CPU card, and describes the conformal coating.

6.1 Electrical and Mechanical Specifications

6.1.1 Smart Star Backplane

Figure 19 shows the mechanical dimensions for the two Smart Star backplanes.

Figure 19. Smart Star Backplane Dimensions

NOTE	All diagram and graphic measurements are in inches followed by millimeters enclosed in parentheses.

Table 3 lists the electrical, mechanical, and environmental specifications for the Smart Star backplanes.

Table 3. Smart Star Backplane Specifications 

Parameter	Specification
	SR9010	SR9050
Board Size	6.50" × 4.20" × 0.75" (165 mm × 107 mm × 19 mm)	3.75" × 4.40" × 0.75" (95 mm × 112 mm × 19 mm)
Connectors	one 2 × 26 (CPU card slot), 2 mm seven 2 × 13 (I/O card slots), 2 mm	one 2 × 26 (CPU card slot), 2 mm three 2 × 13 (I/O card slots), 2 mm
Slot Select	Each slot has a predefined dedicated set of addresses (see Appendix E and the software chapters in the individual I/O card manuals)
Temperature	-40°C to +70°C
Humidity	5% to 95%, noncondensing
External Input Voltage	9 V to 30 V DC at 1 A typical for onboard +5 V regulated supply; provision for independent 9 V to 30 V DC (V_USER) voltage source for I/O cards--the exact voltage for the second supply depends on the requirements of the specific I/O cards used (Z-World recommends tying V_USER to +RAW unless there is a specific need for an independent power supply)
Onboard Voltage Regulator	Surface-mount switching regulator sources 5 V at 1 A
Data Lines	Buffered bidrirectional data lines (D0-D7)
Address Lines	Buffered address lines (A0-A3)
Read/Write Control	Buffered IORD, IOWR
Reset	I/O cards and CPU card can be reset independently

6.1.2 CPU Card

Figure 20 shows the mechanical dimensions for the CPU cards.

Figure 20. CPU Card Dimensions

Table 4 lists the electrical, mechanical, and environmental specifications for the CPU card.

Table 4. CPU Card Specifications 

Parameter	Specification
Board Size (with optional backup battery board)	4.00" × 3.12" × 1.00" (102 mm × 79.2 mm × 25.4 mm)
Connectors	one RJ-45 (Ethernet) (SR9150 only) one 2 × 5, 2 mm pitch (serial programming port) one 0.9 mm × 0.5 screw-terminal connector strips (accept 14-30 AWG or 0.05-1.5 mm² wire)
Ethernet Interface (SR9150 only)	Direct connection to 10Base-T Ethernet networks via RJ-45 connection
Temperature	-40°C to +70°C
Humidity	5% to 95%, noncondensing
Input Voltage	5 V DC at 190 mA typical
Microprocessor	Rabbit 2000TM
Clock	22.1 MHz
SRAM	128K, surface mounted, 512K option
Flash EPROM	2 × 256K, surface mounted
Timers	Five 8-bit timers cascadable in pairs, one 10-bit timer with 2 match registers that each have an interrupt
Serial Ports	Three serial ports: · one CMOS-compatible programming port · remaining ports software-configurable as two 3-wire RS-232, one 5-wire RS-232, or one 3-wire RS-232/ one RS-485
Serial Rate	Selected baud rates up to 115, 200 bps CMOS-compatible port supports up to 6.45 Mbps (synchronous)
Watchdog/Supervisor	Yes
Time/Date Clock	Yes
Expansion Port	Supports up to 7 I/O cards
Backup Battery	Yes: Panasonic CR2330 or equivalent 3 V lithium coin type, 265 mA·h standard using onboard battery holder; provision for external battery

6.2 Jumper Configurations

Figure 21 shows the header locations used to configure the various CPU card options via jumpers.

Figure 21. Location of Smart Star CPU Card Configurable Positions

Table 5 lists the configuration options.

Table 5. Smart Star CPU Card Jumper Configurations

Header	Description	Pins Connected		Factory Default
JP1	RS-485 Bias and Termination Resistors	1-2 5-6	Bias and termination resistors connected	×
		1-3 4-6	Bias and termination resistors not connected1
JP2	U5 Flash Memory Size	1-2	128K/256K	×
		2-3	512K
JP3	SRAM Size	1-2	128K	×
		2-3	512K
JP4	U11 Flash Memory Size	1-2	128K/256K	×
		2-3	512K
JP5	Flash Memory Bank Select	1-2	Normal Mode	×
		2-3	Bank Mode

1 Although pins 1-3 and 4-6 of header JP1 are shown "jumpered" for the termination and bias resistors not connected, pins 3 and 4 are not actually connected to anything, and this configuration is a "parking" configuration for the jumpers so that they will be readily available should you need to enable the termination and bias resistors in the future.

6.3 Conformal Coating

The areas around the crystal oscillator and the battery backup circuit on the CPU card have had the Dow Corning silicone-based 1-2620 conformal coating applied. The conformally coated areas are shown in Figure 22. The conformal coating protects these high-impedance circuits from the effects of moisture and contaiminants over time.

Figure 22. CPU Card Areas Receiving Conformal Coating

Any components in the conformally coated area may be replaced using standard soldering procedures for surface-mounted components. A new conformal coating should then be applied to offer continuing protection against the effects of moisture and contaminants.

NOTE	For more information on conformal coatings, refer to Rabbit Semiconductor Technical Note 303, Conformal Coatings.

6.4 Use of Rabbit 2000 Parallel Ports

Figure 23 shows the Rabbit 2000 parallel ports.

Figure 23. Smart Star CPU Card Rabbit 2000 Systems

6.5 Exclusion Zone

It is recommended that you allow for an "exclusion zone" of 3" (80 mm) around the Smart Star in all directions when the Smart Star is incorporated into an assembly that includes other components. This "exclusion zone" that you keep free of other components and boards will allow for sufficient air flow, and will help to minimize any electrical or EMI interference between adjacent boards.

Z-World http://www.zworld.com Voice: (530) 757-3737 FAX: (530) 757-3792 sales@zworld.com