L9966 datasheet(59/122 Pages) STMICROELECTRONICS

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Output

14.1

Analog output AOX

AOX buffer is a rail to rail buffer capable of outputting the analog IO[12:1] voltage to AOX output pin through

an internal analog multiplexer. The channel being fed to the AOX output is selected by RAOX[3:0] bit on the

SWITCH_ROUTE register. The default state of the AOX is HiZ with no connection to any IO channel.

Table 40. AOX electrical parameters

Symbol

Parameter

Condition

Min

Typ Max Unit

UBSW = 7.5 V:36 V, VDD5V = 4.85 V:5.15 V, Tj-max = 150 °C unless otherwise specified.

VoutH

Output high level

Input 0 V to 5 V

Iload |200 µA|

VDD5-0.1

AOX

VoutL

Output low level

Input 0 V to 5V

Iload |200 µA|

0.1

AOX

AOXerr AOX input/output offset error

Input voltage range

0.04 V – (VDD5-20 mV), outside this range offset is 13 mV (1)

-5

mV AOX

1. Guaranteed by design.

AOX pin output voltage follows the input voltage with AOXerr offset in range defined in Table 40. AOX electrical

parameters.

The AOX pin is designed to drive an RC low pass filter with 10 kΩ min resistor followed by a capacitor towards

ground.

Bandwidth is limited by FlexInput analog IO input filter time constant ADC1tau_1_12 (see Table 21. ADC analog

constant time).

In addition to the analog IO[12:1] the following internal voltages can be routed on AOX for ASIC functionality

monitoring: internal Band Gap, ADCx reference voltage, VRSP, see Table 41. Signal routed on AOX.

Table 41. Signal routed on AOX

Symbol

Parameter

Condition

Min

Typ

Max

Unit

UBSW = 7.5 V:36 V, VDD5V = 4.85 V:5.15 V, Tj-max = 150 °C unless otherwise specified.

VBG_INT

Internal band gap

Design info

-5%

1.24

VREF

ADCx reference voltage

Design info 5V_REF = 5 V

-1%

1.25

VRSP

VRSP voltage gain

RAOX[3:0] = 0xF

-2%

V/V

14.2

Digital outputs SENTx_GTMx

SENTx_GTMx buffers can be configured for digital signal routing; in such a case the buffers can be configured as

output for digital signal routing. In such case the state of the comparators properly programmed for each IOx will

set the output state..

Digital routing to SENTx_GTMx buffer is configured through GTM_TO_SENT_ROUTE_1_2 and

GTM_TO_SENT_ROUTE_3_4 registers. By default, SENT4_GTM4 is connected to IO15, while the remaining

buffers are in HiZ.

Once an Input channel is routed on SENTx_GTMx, the output depends on the thresholds selected for that specific

IOx, either absolute or ratiometric.

L9966

Output

DS12459 - Rev 10

page 59/122

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