AS8846 datasheet(8/35 Pages) AMSCO

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Data Sheet AS8446

Revision 1.8, Date 2005-03-17

Page 8 of 35

Characteristics for Analog and Digital Inputs and Outputs

CMOS LV Digital Input

Pins: Clk, DATAin, CS, PWM, WD

Parameter

Symbol

Min

Max

Unit Note

High Level Input Voltage

VIH

0.7 * VDD

Low Level Input Voltage

VIL

0.3 * VDD

Input Leakage Current

ILEAK

-1

µA

pull-up/down current for inputs with

pull-up/down typ. 60µA

Table 6

CMOS Input parameters

CMOS LV Digital Output

Pins: RESET, DATAout, FAIL

Parameter

Symbol

Min

Max

Unit Note

High Level Output Voltage

VOH

VDD -0.5

CLOAD = 50 pF

Low Level Output Voltage

VOL

VSS +0.4

CLOAD = 50 pF

Table 7

CMOS Output parameters

Analog Signals Input / Output

Pins: Vpump, CP1, CP2, OUT, CMP, CMN, VMO, ADC, TP, Iref

Parameter, Pin Name

Pin type

Symbol

Min

Typ

Max

Unit Note

Charge Pump Voltage, pin: Vpump

HV S

Vpump

Vbat + 6

Vbat + 4

Vbat

+ 10

Vbat + 14

(1)

Charge pump switched capacitor

voltage, pin: CP1

HV AIO

VCP1

VSS

Vbat

Charge pump switched capacitor

voltage, pin: CP2

HV AIO

VCP2

VSS

Vbat + 14

HS driver source current, pin: OUT

HV AO

Iout_p

-500

(2)

HS driver sink current, pin: OUT

HV AO

Iout_n

500

(2)

Motor current measurement inputs,

Common mode range, pins: CMP, CMN

HV AI

VCMP, VCMN

-1.5

Vbat

Motor voltage input, pin: VMO

HV AI

VVMO

-1.5

Vbat

Analog measurement output voltage,

pin: ADC

LV AO

VA_current

VDD

Multiplexed analog

output (3)

External temperature sensor input,

threshold voltage, pin: TP

LV AI

VTP_th

00.5

VDD

Threshold voltage:

VDD / 2

Reference current generation voltage,

pin: Iref

LV AI

Vref

1.0

(4)

Note (1):

external capacitors CP1/2 = 100 nF, CP0 = 400 nF recommended;

on chip Vpump monitoring and protection: Vpump_min = (Vbat + 6 V) or (Vbat + 4 V), programmable

Note (2):

typical rise/ fall time at the external Power MOSFET source: 0.2 µs to 0.5 µs,

independently programmable rise and fall times, voltage range of the voltage VOUT = 0 … Vpump

Note (3):

Multiplexed output (controlled by register R15<3:0> = ADC_CH, see section Summary of all programmable

registers (parameters, functions) Full motor current measurement range corresponds to VADC = 4.0 V. Multiplexed output

must not be switched during operation!

Note (4):

regulated voltage Vref = 1.0 V, external resistor Rref = 22 k

Ω must be connected to generate the 45 µA

reference current. Use Pin Iref to connect Rref only.

Table 8

Analog signal parameters

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