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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADBMS2950BCCSZ датащи(PDF) 37 Page - Analog Devices |
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ADBMS2950BCCSZ датащи(HTML) 37 Page - Analog Devices |
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37 / 97 page  Data Sheet ADBMS2950B Rev. 0 | Page 37 of 97 Even though all the V1-V10, VBAT1, and VBAT2 pin voltages must not be lower than −0.1V vs. GND, the VxADCs and VBxADCs are bipolar and can measure lower negative differential signals. For example, V1 = 0.5V vs. VREF1P25 = 1.25V yields a −0.75V differential ADC measurement. When biasing resistive dividers to VREF1P25, the specified range of VREF1P25 (see Voltage Reference Specifications) and the input pin voltage (see Table 3 and Table 5) must be considered for the guaranteed measurement range. For example, if VREF1P25 is at 1.30V, the voltage drop at the resistor must not exceed 1.2V to meet the maximum input pin voltage of 2.5V. The measurement transfer function becomes non-linear for bigger signals but remains monotonic (see VBxADC and VxADC Transfer Function section). The VREF1P25 output pin is a potential source of common- cause faults for NTC temperature measurements. Where not all Vx inputs are used it is recommended to loop back the VREF1P25 externally to any spare Vx pin and perform out-of- range checks periodically. Auxiliary Measurements The ADBMS2950B features an auxiliary ADC preceded by the auxiliary multiplexer to measure various signals including the power supply pins, the buffered 1.25V reference output VREF1P25, and the internal temperature sensors. The multiplexer inputs are listed in Table 48; MUXP indicates the positive multiplexer input and MUXN indicates the negative multiplexer input. The Auxiliary ADC is triggered by the ADX command, which measures all input channels in a round-robin fashion. It takes 2.1 ms to measure all the eight channels. Table 48. AUX ADC Measurement Sequence Step MUXP MUXN Time Description 1 VDIV GND 0.27 ms Divided VREF1 reference voltage. 2 EPAD GND 0.53 ms Exposed pad. 3 VREF1P25 RGND 0.80 ms VREF1P25 reference pin voltage. 4 VDIG GND 1.06 ms Internal digital 3V supply. 5 VDD GND 1.33 ms VDD power supply pin. 6 TMP1 RGND 1.59 ms Primary internal temperature sensor. 7 VREG GND 1.86 ms VREG power supply pin. 8 TMP2 GND 2.12 ms Secondary internal temperature sensor. Table 49. V1ADC, V2ADC, AUX ADC Command Codes Name Type BIT 10 BIT 9 BIT 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 Description ADV CMD 1 0 0 OW[1:0] 1 1 VCH[3:0] Start V1ADC and V2ADC. ADX CMD 1 0 1 0 0 1 1 0 x x x Start AUX ADC. CLRVX CMD 1 1 1 0 0 0 1 0 0 1 0 Clears all VxADC and AUX ADC results (ADBMS6830B: CLRAUX). RDV1A RD48 0 0 0 0 0 0 0 1 0 1 0 Reads V1ADC results (ADBMS6830B: RDCVD). 0 0 0 0 0 0 1 0 1 0 1 ADBMS6830B compatible code RDFCD. 0 0 0 0 1 0 0 1 0 1 0 ADBMS6830B compatible code RDACD. 0 0 0 0 0 0 1 1 0 0 1 ADBMS6830B compatible code RDAUXA. RDV1B RD48 0 0 0 0 0 0 0 1 0 0 1 Reads V1ADC results (ADBMS6830B: RDCVE). 0 0 0 0 0 0 1 0 1 1 0 ADBMS6830B compatible code RDFCE. 0 0 0 0 1 0 0 1 0 0 1 ADBMS6830B compatible code RDACE. 0 0 0 0 0 0 1 1 0 1 0 ADBMS6830B compatible code RDAUXB. RDV1C RD48 0 0 0 0 0 0 0 0 0 1 1 Reads V1ADC results (ADBMS6830B: RDSVA). RDV1D RD48 0 0 0 0 0 0 1 1 0 1 1 Reads V1ADC/V2ADC results (ADBMS6830B: RDAUXC). RDV2A RD48 0 0 0 0 0 0 0 0 1 1 1 Reads V2ADC results (ADBMS6830B: RDSVC). 0 0 0 0 0 0 1 1 1 0 0 ADBMS6830B compatible code RDRAXA. RDV2B RD48 0 0 0 0 0 0 0 1 1 0 1 Reads V2ADC results (ADBMS6830B: RDSVD). 0 0 0 0 0 0 1 1 1 0 1 ADBMS6830B compatible code RDRAXB. RDV2C RD48 0 0 0 0 0 0 0 0 1 0 1 Reads V2ADC results (ADBMS6830B: RDSVB). RDV2D RD48 0 0 0 0 0 0 1 1 1 1 1 Reads V1ADC/V2ADC results (ADBMS6830B: RDAUXD). RDV2E RD48 0 0 0 0 0 1 0 0 1 0 1 Reads V2ADC results (ADBMS6830B: RDRAXD). RDXA RD48 0 0 0 0 0 1 1 0 0 0 0 Reads AUX ADC results (ADBMS6830B: RDSTATA). RDXB RD48 0 0 0 0 0 1 1 0 0 0 1 Reads AUX ADC results (ADBMS6830B: RDSTATB). RDXC RD48 0 0 0 0 0 1 1 0 0 1 1 Reads AUX ADC results (ADBMS6830B: RDSTATD). RDALLV RD160 0 0 0 0 0 1 1 0 1 0 1 Reads all external input V1ADC results and V9, V10 results measured by V2ADC only. RDALLR RD160 0 0 0 0 0 0 1 0 0 0 1 Reads all external input V2ADC results and V7, V8 results measured by V1ADC only. RDALLX RD160 0 0 0 0 1 0 1 0 0 0 1 Reads all AUX ADC results. |
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