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MAX1460 Datasheet(PDF) 12 Page - Maxim Integrated Products |
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MAX1460 Datasheet(HTML) 12 Page - Maxim Integrated Products |
12 / 20 page Low-Power, 16-Bit Smart ADC 12 ______________________________________________________________________________________ There are three internal DSP registers that are directly observable on the SDIO and SDO pins: • S: 16-bit DSP Scratch or Accumulator register, con- taining the result of the execution of the current microcode instruction. • P: 8-bit DSP Program Pointer register, which holds the address of the instruction ROM microcode. • PS: 8-bit DSP Program Store register. PS is the instruction that the DSP is currently executing. PS is the instruction ROM data at address P. The DSP instructions relevant to the test system are list- ed in Table 8. After the test system sends the Start Conversion com- mands 8 hex or A hex, SDIO and SDO are both enabled as MAX1460 serial outputs. The test system should disable (high impedance) its SDIO driver to avoid a bus conflict at this time so that the MAX1460 can drive the pin. After the DSP executes each one of the microcode instructions, the contents of the registers S, P, and PS are output in a serial format (Figure 4). A new DSP instruction and a new state of the S, P, and PS registers are delivered every 16n + 9 clock cycles, where n = 0, 1, 2... after the Start Conversion command completes. The tester should latch the SDIO and SDO 0F MSB Configuration LSB 0D 0E 1F MSB 0B Gain LSB EE Address (hex) 10 1D 09 Contents 1E 0A 1B EE Address (hex) 20 19 Contents 1A 0C 1C 18 16 08 17 14 12 06 13 15 11 07 2F MSB G1 04 LSB 2D 02 2E 03 3F MSB 05 2B G2 LSB 01 EE Address (hex) 30 3D 29 Contents 3E 2A 3B EE Address (hex) 40 39 Contents 3A 2C 3C 38 36 28 37 34 32 26 33 35 31 27 24 22 23 25 21 4F MSB Of0 LSB 4D 4E 5F MSB 4B Of1 LSB EE Address (hex) 50 5D 49 Contents 5E 4A 5B EE Address (hex) 60 59 Contents 5A 4C 5C 58 56 48 57 54 52 46 53 55 51 47 6F MSB Of2 44 LSB 6D 42 6E 43 7F MSB 45 6B DOFF LSB 41 EE Address (hex) 70 7D 69 Contents 7E 6A 7B EE Address (hex) 00 79 Contents 7A 6C 7C 78 76 68 77 74 72 66 73 75 71 67 64 62 63 65 61 Table 7. EEPROM Memory Map D7 Register 7—DOFF Register 8—Temperature Signal Register 0—Configuration 56 Register 9—Sensor Signal D8 01 D9 Register 1—Gain 3B Register 10—Compensated Output D D0 66 or 6C EA 65 or 6B D1 47 Register 2—G1 D2 11 D3 2E Register 3—G2 Register 4—Of0 Register 5—Of1 D4 38 D5 03 Register 6—Of2 D6 22 INSTRUCTION CODE (PS) (HEX) S REGISTER VALUE PROGRAM COUNTER (P) (HEX) Table 8. Subset of DSP Instruction |
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