L9396 datasheet(65/109 Pages) STMICROELECTRONICS

65 / 109 page

DS12539 Rev 10

65/109

L9396

System functional safety implementations

109

Figure 10. ADC conversion time

All electrical characteristics are valid for the following conditions unless otherwise noted:

-40 °C ≤ Tj ≤ +175 °C; 6 ≤ VBST ≤ 19 V

7.2.2

Voltage measurement

The device includes a 10-bit ADC converter with high voltage multiplexer stage to report any

of the relevant internal voltage levels through SPI.

It further includes 3 discrete analog input pins AI2, AI3, AI4, 0.2V to 5V range, for external

generic measurements.

All the channels are acquired cyclically after the SSM reset is released and the values are

available on the ADC CONV REG x registers. A digital programmable filter is implemented

in order to reduce the noise.

Setting the ADC CONFIG NSUM [2:0] bits in ADC_CFG register the filter will return the

average values calculated on N samples acquired for each channel to be converted. The

conversion time of the cycle depends on N following this table:

Pre-

ADC

T_SC

UPDATED

IQ = Intra-Queue Settling Time = 0.5625 µs

T_ SC = Single Sample Conversion Time= 2.0625 µs

S = # of Samples (default = 4 for voltage only measurements)

Pre-AD C = Initial ADC Settling Time = 2.81 µs

T_SC

Nsum

GADG2301171629PS

Table 45. Analog to digital converter

Symbol

Parameter

Comments / Conditions

Min

Typ

Max

Unit

VADC_RANGE ADC input voltage range

0.1

2.5

VADC_REF_H ADC Reference voltage

-3%

2.5

+3%

ADC_RES

ADC resolution(1)

Design Info

bit

Differential non linearity

error (DNL)

-2

LSB

Integral non linearity error

(INL)

-3.5

+3.5

LSB

Total error

Not including reference

voltage error

-5

LSB

Internal BG reference

readout

480

492

504

LSB

Internal BG monitor

readout

480

492

504

LSB

1. LSB = (2.5 V / 1024) = 2.44 mV.

L9396 数据表(PDF) 65 Page - STMicroelectronics

L9396 数据表(HTML) 65 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载