TMS370 datasheet(40/43 Pages) TI

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TMS370Cx32

8-BIT MICROCONTROLLER

SPNS015C – FEBRUARY 1990 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

ADC1 converter (continued)

The ADC1 module allows complete freedom in design of the sources for the analog inputs. The period of the

sample time is user-defined so that the high-impedance can be accommodated without penalty to the

low-impedance sources. The sample period begins when the SAMPLE START bit of the ADC1 control register

(ADCTL.6) is set to 1. The end of the signal sample period occurs when the conversion bit (CONVERT START,

ADCTL.7) is set to 1. After a hold time, the converter will reset the SAMPLE START and CONVERT START bits,

signaling that a conversion has started and that the analog signal can be removed.

analog timing requirements (see Figure 18)

MIN

MAX

UNIT

tsu(S)

Setup time, analog to sample command

th(AN)

Hold time, analog input from start of conversion

18tc

tw(S)

Pulse duration, sample time per kilo-

Ω of source impedance†

µs/kΩ

† The value given is valid for a signal with a source impedance > 1 k

Ω. If the source impedance is < 1 kΩ, use a minimum sampling time of 1µs.

Analog In

Sample Start

Convert Start

Analog Stable

th(AN)

tw(S)

tsu(S)

Figure 18. Analog Timing

Table 18 is designed to aid the user in referencing a device part number to a mechanical drawing. The table

shows a cross-reference of the device part number to the TMS370 generic package name and the associated

mechanical drawing by drawing number and name.

Table 18. TMS370Cx32 Family Package Type and Mechanical Cross-Reference

PKG TYPE

(mil pin spacing)

TMS370 GENERIC NAME

PKG TYPE NO. AND

MECHANICAL NAME

DEVICE PART NUMBERS

FN – 44 pin

(50-mil pin spacing)

PLASTIC LEADED CHIP CARRIER

(PLCC)

FN(S-PQCC-J**) PLASTIC J-LEADED

CHIP CARRIER

TMS370C032AFNA

TMS370C032AFNL

TMS370C032AFNT

TMS370C332AFNA

TMS370C332AFNL

TMS370C332AFNT

TMS370C732AFNT

FZ – 44 pin

(50-mil pin spacing)

CERAMIC LEADED CHIP CARRIER

(CLCC)

FZ(S-CQCC-J**) J-LEADED CERAMIC

CHIP CARRIER

SE370C732AFZT

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