L9966 datasheet(23/122 Pages) STMICROELECTRONICS

23 / 122 page

1. Once defined the IPD, if the IO voltage is decreasing, the Pull Down current value is guaranteed down to

VPDsat. In case of IO shorted to GND, the voltage on the pin tries to be increased up to VPDsat.

2. In case 20 µA is selected ,minimum voltage to guarantee current is 750 mV , below 750 mV current may be

zero.

6.2

Pull-up current programming

Internal pre-regulated voltage (VPRE) is implemented to protect internal circuitry against high voltage UBSW:

VPRE value with respect to UBSW is reported in Table 12.

Table 12. Pre-regulated voltages value

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.

VPRE_L Internal pre-regulated voltage

UBSW <20 V (115 mA @ 150 °C: 5 channels with

20 mA each)

UBSW-0.2

UBSW-025

UBSW

IO1-12

IO13-15

VPRE_H Internal pre-regulated voltage clamp UBSW >22 V

IO1-15

The pull up current sources are implemented as current generators supplied from VPRE.

That means the 5V_REF and VVAR current sources are obtained from VPRE through a voltage limitation. The

VVAR voltage is adjusted by register DWT_VOLT_SRC_LSF_CTRL bit VVAR_V[4:0].

Every time the pull up voltage reference is changed, in order to avoid overshoot, it is recommended to switch first

in HiZ. For IO[12:9] any VVAR modification automatically leads to a switch in HiZ.

Pull up regulated voltage values are VPRE over the ones reported in Table 13. Regulated voltages value.

In case of IO[15:13] the only possible pull up is to VPRE; the other pull up voltage, VVAR or 5V_REF, are

automatically redirected to VPRE

Table 13. Regulated voltages value

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.

5V_REF

5 V voltage level

Tested at open load, UBSW > 7.5 V

-2%

+2%

IO1-12

5V_REF_drop 5 V voltage drop

Tested at open load,

5.5 V < UBSW < 7.5 V

0.75

IO1-12

VVAR

Variable voltage source

range

0.8

1.9

IO1-12

VVAR_acc

Variable voltage source

accuracy

-50

+50

mV IO1-12

VVAR_step

Variable voltage source step

mV IO1-12

5V_REF_dly

5V_REF delay time

From enable to start of rising front, digital delay not effecting

150

µs

IO1-12

5V_REF_rise 5V_REF rise time

From 20% to 80% Tested at open load, current source=Ipu_7

(Voltage slope on IO depends on current selected, and load

on the IO)

200

µs

IO1-12

VVAR_dly

VVAR delay time

From enable to start of rising front

120

µs

IO1-12

VVAR_rise

VVAR rise time

From 20% to 80% Tested at open load, current

source = Ipu_7 (Voltage slope on IO depends on current

selected, and load on the IO)

200

µs

IO1-12

VPRE_dly

VPRE delay time

From enable to start of rising front, digital delay not effecting

150

µs

IO1-15

VPRE_rise

VPRE rise time

From 20% to 80% of VPRE_H.

200

µs

IO1-15

L9966

Pull-up current programming

DS12459 - Rev 10

page 23/122

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