RabbitCore RCM2100 User's Manual

> ## Appendix A. RabbitCore RCM2100 Specifications

> Appendix A provides the specifications for the RCM2100, and describes the conformal coating.

> ### A.1 Electrical and Mechanical Characteristics

> Figure A-1 shows the mechanical dimensions for the RCM2100.

> Figure A-1. RCM2100 Dimensions

> Table A-1 provides the pin 1 locations for the RCM2100 headers viewed from the top side (as in Figure A-1).

> Table A-1. RCM2100 Header Pin 1 Locations
> Header | Description | Pin 1 (x,y) Coordinates (Inches)
> J1 | RCM2100 subsystems | (3.350, 1.731)
> J2 | RCM2100 subsystems | (0.975, 1.731)
> J3 | Unisolated Ethernet signals (RCM2110 without RJ-45 jack/transformer) | (0.224, 0.861)

> It is recommended that you allow for an "exclusion zone" of 0.25" (6 mm) around the RCM2100 in all directions when the RCM2100 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. An "exclusion zone" of 0.12" (3 mm) is recommended below the RCM2100 when the RCM2100 is plugged into another assembly using the shortest connectors for headers J1 and J2 on the RCM2100. Figure A-2 shows this "exclusion zone."

> Figure A-2. RCM2100 "Exclusion Zone"

> Table A-2 lists the electrical, mechanical, and environmental specifications for the RCM2100.

> Table A-2. RCM2100 Specifications
> Parameter | Specification
> Board Size | 2.00" × 3.50" × 0.80" (51 mm × 89 mm × 20 mm)
> Operating Temperature | -40°C to +70°C
> Humidity | 5% to 95%, noncondensing
> Input Voltage | 4.75 V to 5.25 V DC
> Current | 140 mA at 22.1 MHz, 5 V DC; 82 mA at 11.05 MHz, 5 V DC
> General-Purpose I/O | 34 parallel I/0 lines grouped in five 8-bit ports (shared with serial ports): 20 configurable for I/O, 8 fixed inputs, 6 fixed outputs
> Memory, I/O Interface | 13 address lines, 8 data lines, I/O read/write, buffer enable
> Additional Digital Inputs | Startup mode (2 for master/slave), reset in
> Additional Digital Outputs | Status, clock, watchdog out, reset out
> Ethernet Interface | 10base-T
> Microprocessor | Rabbit 2000
> Clock | 22.1 MHz
> SRAM | 512K × 8, surface mount
> Flash Memory | Two 256K × 8, surface mount
> Timers | Five 8-bit timers cascadable in pairs, one 10-bit timer with 2 match registers that each have an interrupt
> Serial Ports | Four CMOS-compatible ports. Two ports are configurable as clocked ports, one is configurable as RS-232 programming port.
> Serial Rate | CMOS: maximum asynchronous 690,625 bps maximum synchronous 5.52 Mbps
> Slave Interface | A slave port allows the RabbitCore RCM2100 to be used as an intelligent peripheral device slaved to a master processor, which may either be another Rabbit 2000 or any other type of processor
> Watchdog/Supervisor | Yes
> Time/Date Clock | Yes
> Socket Strip (for connection to headers J1 and J2) | Pinrex 2x20, 2 mm pitch (PS2S-2X20GOB)
> Backup Battery | Provision for user-supplied backup battery (2.85 V to 3.15 V) via connections on header J2

> #### A.1.1 Headers

> The RCM2100 uses headers at J1, J2, and J3 for physical connection to other boards. J1 and J2 are 2 × 20 SMT headers with a 2 mm pin spacing. J3 is a 2 × 5 header with a 2 mm pin spacing.

> Figure A-3 shows the layout of another board for the RCM2100 to be plugged in to. These values are relative to the header connectors.

> Hole diameters of 0.035 inches are recommended for the user board that the RabbitCore RCM2100 will be plugged into.

> Figure A-3. User Board Footprint for the RCM2100

> #### A.1.2 Physical Mounting

> A 9/32" (7 mm) standoff with a 4-40 screw is recommended to attach the RCM2100 to a user board at the hole position shown in Figure A-3. A standoff with a screw may also be used at the hole position close to the RJ-45 Ethernet connector for a second anchor, or you may opt to have a nut and bolt with a wire at this hole position if you removed resistor R5 and elected to ground the RJ-45 Ethernet connector to the chassis.

> ### A.2 Bus Loading

> You must pay careful attention to bus loading when designing an interface to the RabbitCore RCM2100. This section provides bus loading information for external devices.

> Table A-3 lists the capacitance for the various RCM2100 I/O ports.

> Table A-3. Capacitance of RCM2100 I/O Ports
> I/O Ports | Input Capacitance | Output Capacitance
> Typ. | Max. | Typ. | Max.
> Parallel Ports A to E | 6 pF | 12 pF | 10 pF | 14 pF
> Data Lines BD0-BD7 | 12 pF | 18 pF | 18 pF | 22 pF
> Address Lines BA0-BA12 | -- | -- | 8 pF | 12 pF

> Table A-4 lists the external capacitive bus loading for the various RCM2100 output ports. Be sure to add the loads for the devices you are using in your custom system and verify that they do not exceed the values in Table A-4.

> Table A-4. External Capacitive Bus Loading -40°C to +70°C
> Output Port | Clock Speed (MHz) | Maximum External Capacitive Loading (pF)
> A[12:0] D[7:0] | 22.1 | 50
> PD[3:0] | 22.1 | 100
> PA[7:0] PB[7,6] PC[6,4,2,0] PD[7:4]1 PE[7:0] | 22.1 | 90
> All data, address, and I/O lines with clock doubler disabled | 11.0592 | 100

> 1 The Parallel Port D outputs (PD[7:4]) are available only on the RCM2120 and the RCM2130 models.

> Figure A-4 shows a typical timing diagram for the Rabbit 2000 microprocessor memory read and write cycles.

> Figure A-4. Memory Read and Write Cycles

> Tadr is the time required for the address output to reach 0.8 V. This time depends on the bus loading. Tsetup is the data setup time relative to the clock. Tsetup is specified from 30%/70% of the VDD voltage level.

> ### A.3 Rabbit 2000 DC Characteristics

> Table A-5 outlines the DC characteristics for the Rabbit 2000 at 5.0 V over the recommended operating temperature range from Ta = -40°C to +85°C, VDD = 4.5 V to 5.5 V.

> Table A-5. 5.0 Volt DC Characteristics
> Symbol | Parameter | Test Conditions | Min | Typ | Max | Units
> IIH | Input Leakage High | VIN = VDD, VDD = 5.5 V |  |  | 10 | µA
> IIL | Input Leakage Low (no pull-up) | VIN = VSS, VDD = 5.5 V | -10 |  |  | µA
> IOZ | Output Leakage (no pull-up) | VIN = VDD or VSS, VDD = 5.5 V | -10 |  | 10 | µA
> VIL | CMOS Input Low Voltage |  |  |  | 0.3 x VDD | V
> VIH | CMOS Input High Voltage |  | 0.7 x VDD |  |  | V
> VT | CMOS Switching Threshold | VDD = 5.0 V, 25°C |  | 2.4 |  | V
> VOL | CMOS Output Low Voltage | IOL = See Table A-6 (sinking) VDD = 4.5 V |  | 0.2 | 0.4 | V
> VOH | CMOS Output High Voltage | IOH = See Table A-6 (sourcing) VDD = 4.5 V | 0.7 x VDD | 4.2 |  | V

> ### A.4 I/O Buffer Sourcing and Sinking Limit

> Unless otherwise specified, the Rabbit I/O buffers are capable of sourcing and sinking 8 mA of current per pin at full AC switching speed. Full AC switching assumes a 22.1 MHz CPU clock and capacitive loading on address and data lines of less than 100 pF per pin. Pins A0-A12 and D0-D7 are each rated at 8 mA. The absolute maximum operating voltage on all I/O is VDD + 0.5 V, or 5.5 V.

> Table A-6 shows the AC and DC output drive limits of the parallel I/O buffers when the Rabbit 2000 is used in the RCM2100.

> Table A-6. I/O Buffer Sourcing and Sinking Capability
> Pin Name | Output Drive Sourcing1/Sinking2 Limits (mA)
> Output Port Name | Full AC Switching SRC/SNK | Maximum3 DC Output Drive SRC/SNK
> PA [7:0] | 8/8 | 12/12
> PB [7, 1, 0] | 8/8 | 12/12
> PC [6, 4, 2, 0] | 8/8 | 12/12
> PD [7:4] | 8/8 | 12/12
> PD [3:0]4 | 16/16 | 25/25
> PE [7:0] | 8/8 | 12/12

> 1 The maximum DC sourcing current for I/O buffers between VDD pins is 112 mA. 2 The maximum DC sinking current for I/O buffers between VSS pins is 150 mA. 3 The maximum DC output drive on I/O buffers must be adjusted to take into consideration the current demands made my AC switching outputs, capacitive loading on switching outputs, and switching voltage. The current drawn by all switching and nonswitching I/O must not exceed the limits specified in the first two footnotes. 4 The combined sourcing from Port D [7:0] may need to be adjusted so as not to exceed the 112 mA sourcing limit requirement specified in the first footnote.

> ### A.5 Conformal Coating

> The areas around the crystal oscillator has had the Dow Corning silicone-based 1-2620 conformal coating applied. The conformally coated area is shown in Figure A-5. The conformal coating protects these high-impedance circuits from the effects of moisture and contaminants over time.

> Figure A-5. RCM2100 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.

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