POWERSTEP01 datasheet(35/92 Pages) STMICROELECTRONICS

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powerSTEP01

Functional description

The gate current can be set to one of following values: 4, 8, 16, 24, 32, 64 and 96 mA

through the IGATE parameter in the GATECFG1 register.

Controlled current time can be programmed within range from 125 ns to 3.75

s with

a resolution 125 ns (TCC parameter in GATECFG1 register).

Turn-off overboost time can be set to one of following values: 0, 62.5, 125, 250 ns (TBOOST

parameter in GATECFG1 register). The 62.5 ns value is only available when clock

frequency is 16 MHz or 32 MHz; when clock frequency is 8 MHz it is changed to 125 ns and

when a 24 MHz clock is used it is changed to 83.3 ns.

7.17

Deadtime and blanking time

During the bridge commutation, a deadtime is added in order to avoid cross conductions.

The deadtime can be programmed within a range from 125 ns to 4

s with a resolution of

125 ns (TDT parameter in the GATECFG2 register) (see Section 11.1.26 on page 64).

At the end of each commutation the overcurrent and stall detection comparators are

disabled (blanking) in order to avoid the respective systems detecting body diodes turn-off

current peaks.

The duration of blanking time is programmable through the TBLANK parameter in the

GATECFG2 register at one of the following values: 125, 250, 375, 500, 625, 750, 875, 1000

ns (see Section 11.1.26).

7.18

Integrated analog-to-digital converter

The powerSTEP01 integrates an NADC bit ramp-compare analog to digital converter with a

reference voltage equal to VREG. The analog to digital converter input is available through

the ADCIN pin and the conversion result is available in the ADC_OUT register

(Section 11.1.20 on page 60).

The ADC_OUT value can be used for motor supply voltage compensation or can be at the

user’s disposal.

Table 11. Output slew rate

Slew rate

(VS = 48 V)

Igate

tCC

tDT

tblank

tboost

980 V/µs

96 mA

375 ns

125 ns

500 ns

0 ns

790 V/µs

64 mA

500 ns

125 ns

375 ns

0 ns

520 V/µs

32 mA

875 ns

125 ns

250 ns

0 ns

400 V/µs

24 mA

1000 ns

125 ns

250 ns

0 ns

220 V/µs

16 mA

1600 ns

125 ns

250 ns

0 ns

114 V/µs

8 mA

3125 ns

125 ns

250 ns

0 ns

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