PCF8812USLASH2 datasheet(14/36 Pages) PHILIPS

14 / 36 page

2000 Nov 22

Philips Semiconductors

Product speciﬁcation

× 102 pixels matrix LCD driver

PCF8812

Table 2

Explanations for symbols in Table 1

BIT

RESET STATE

chip is active

chip is in Power-down mode

horizontal addressing

vertical addressing

use basic instruction set

use extended instruction set

PRS

VLCD programming range;

LOW

VLCD programming range;

HIGH

D, E

display blank

D = 0

normal mode

all display segments on

E = 0

inverse video mode

TC1 to

TC0

VLCD temperature

coefﬁcient 0

TC1 to TC0 = 00

VLCD temperature

coefﬁcient 1

VLCD temperature

coefﬁcient 2

VLCD temperature

coefﬁcient 3

S1 to S0

× voltage multiplier

S1 to S0 = 00

× voltage multiplier

VOP 6to

VOP0

VLCD programming

VOP 6toVOP0 = 0000000

BS2 to

BS0

bias system

BS2 to BS0 = 000

10.1

Initialization

Immediately following power-on, all internal registers as

well as the RAM content are undefined; a reset pulse must

be applied.

Reset is accomplished by applying an external reset pulse

(active LOW) at the pad RES. When reset occurs within

the specified time, all internal registers are reset, however

the RAM is still undefined. The state after reset is

described in Section 10.2.

The RES input must be

≤0.3VDD when VDD reaches

VDD(min) (or higher) within a maximal time tVHRL after VDD

going HIGH (see Fig.16).

10.2

Reset function

After reset the LCD driver has the following state:

• Power-down mode (PD = 1)

• Horizontal addressing (V = 0)

• Normal instruction set (H = 0)

• Display blank (E=D=0)

• Address counter X6 to X0 = 0; Y3 to Y0 = 0

• Temperature control mode (TC1 to TC0 = 0)

• Bias system (BS2 to BS0 = 0)

• VLCD is equal to 0; the HV-generator is switched off

(VOP6toVOP0 = 0 and PRS = 0)

• After power-on; RAM data is undefined; the reset signal

doesn’t change the content of the RAM

• All LCD outputs at VSS (display off).

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